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Welcome to again, introduction
to Git and GitHub.

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It's very basic.

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If you have absolutely no clue,

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then this is for you.

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Otherwise it's maybe boring.

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I'm just telling you
how I'm using Git,

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and I am able to

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survive in most of the
cases with that knowledge.

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Sometimes I have to

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read the documentation for
a more advanced stuff,

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but in let's say, 80
percent of the cases

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that I will tell you
now is sufficient.

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Let's actually
start using GitHub.

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It makes things a bit more easy.

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There's also competition
to GitHub. This is GitLab.

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GitLab is particular
interesting because

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the whole system behind
GitLab is open-source.

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This is a hosted version,

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but you can have the
whole system on-prem,

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and also purchase
support from GitLab.

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Those guys are partially in

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Berlin, so they are pretty cool.

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Anyway, let's start
with GitHub here.

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What I will do now is
create a repository.

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A repository is the location
where your stuff goes into.

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Let's call it, I don't know,

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demo, and we can choose

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whether we want to create

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a public or a private repository.

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That repository is remote,

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that's hosted at GitHub,

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and let's initialize
with a README.

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Let's skip gitignore for now,

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I will show you that later.

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We create now repository.

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Once this is created,

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it's very easy to have a copy
of this repository locally.

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There are two options: one is

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cloning it via HTTPS or via SSH.

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I'm always using SSH,

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it just to make things
a bit more easy.

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The only thing you need
to do is you have to add

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your public identity to GitHub.

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I can show you that later.

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Now, the only thing we need to do

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is we go to empty folder,

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and then we say git
clone, and this link.

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What now happens is the contents

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of this is copied to my machine.

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Here, I have to specify my
password for my SSH identity,

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so that's something I need
to explain you later.

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If you know, go to demo.

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You will see here
the README file,

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and you see here there is
content of the README file.

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Now, let's add a file.

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You see here there's only the
README, and the.git folder.

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Please never ever touch it.

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Let's create another file.

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Let's say, vi test.txt,

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and hello, this is a test.

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Now, we add this to the repo.

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First of all, we say
git add test.txt.

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Now, if we say now git status,

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then we see that this file

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is now in the so-called
staging area.

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That's something in-between
your local folder

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and your local repository.

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You have a local folder
with the contents,

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you have a local repository,

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and you have a remote repository.

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Personally, you work with
your local repository,

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and all the other guys
working together with you

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are working also with
their local repositories,

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and do sync all your contents
with the remote repository.

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Now, we want to commit or
let's do something else.

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Let's say, we create
a file test2,

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and we say git add test2.txt.

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Now interestingly, if
we now say git status,

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those are both in
the staging area.

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Now, if we say git commit,

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and we say message
initial commit,

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and that is now in our local
repository on this machine.

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The idea is why you
have the staging area,

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you can control which files

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go into a commit
because let's say,

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the atomic entity here
in git is a commit,

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so everything is around
beat on the commit.

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You can yet definitely control

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which files are going
into a single commit.

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Now, what you want to
do is you want to push

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the contents of

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your local repository
to remote repository.

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Because if you now
go to this here,

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to this GitHub project,

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you see that there is
no additional file.

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We say now, git push.

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What now happens is,

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I again have to
provide a password.

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I don't have the key
agent that running.

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Now, you see here
we have committed

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this local change in

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the local repository
to remote repository.

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Now, you can see that you
have these two files here.

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If you click on that "File",

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you'll see first of
all the content,

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and also you'll see
here which commit

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was responsible for
adding this file.

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Another interesting thing is

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if you are starting from scratch,

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you can also do the
following: Now,

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let's delete this project,

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and this is a bit hard.

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Just to make sure you don't
do that accidentally,

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so delete this repository,

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and you have to say demo here,

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although I think you have to
type the whole thing here.

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Now, this project is deleted.

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Let's do something else.

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Let's create a new repository,

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but now let's init a
repository on my machine.

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Let's call it demo again.

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We don't initialize
it with a README.

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We say create repository.

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If you're lucky, GitHub will show

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us how to do it. Yeah, here.

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Let's actually do it ourselves.

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Let's get rid of the demo folder,

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and let's create it again.

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Now, do what they tell us.

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We create a README,

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and let me say, git init.

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Now, we have it
initialized because now

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we have the.git folder which
you never ever should touch.

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We say git add README,

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but we can also say git add.,

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so it's adding everything
which was in our folder.

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It's only the README.md,

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and then we say,

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git commit as usual,
test or whatever.

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Now, we can't say git push now.

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If we say git push,

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it doesn't know where to push it

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because actually we haven't

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told this local
folder that it should

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connect to remote repository.

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That we do with git
remote add origin,

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and that's the URL
of our project.

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Then we can say git
push u origin master,

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and that's basically it.

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We have to re-enter the
password for my RSA key,

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and if you're lucky,

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and everything worked fine,

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we can now go to the project,

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and we should see
the README file,

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which is the case.

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That's it for now.
That's the first part.

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In the next video, I will
show you how to do branches,

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and actually also how to
create a pull request.

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Thanks for watching,
and see you later.