Welcome to a little introduction to git and github! It’s very basic so if you have absolutely no clue than this is for you, otherwise its maybe boring. I’m just telling you how I’m using it and I am able to survive in most of the cases with that knowledge. Sometimes I have to read the documentation for more advanced stuff, but in eighty percent of the cases what I will tell you now is sufficient. So let's actually start using github that makes things a bit more easy, there’s also competition to github. This is GitLab, GitLab is particularly interesting because the whole system behind GitLab is open source, so this is the hosted version, but you can have the whole system on prem and also purchase support from GitLab. Those guys are partially in Berlin, so they are pretty cool. Anyway, let’s start with github here so what I will do now is create a repository. A repository is the stuff, the location where your stuff goes in. So let’s call it demo, and we can choose whether we want to create a public or private repository. So that repository is remote. Thats hosted at github, and its initialized with a README and lets skip .gitignore for now, I will show you that later. So we create now a repository, and once this is created its very easy to have a copy of this repository locally. There are two options one is cloning it via HTTPS, or via SSH. So I am always using SSH, SSH just makes things a bit more easy and the only thing you need to do is you have to add your public identity to github. I can show you that later. So now the only thing we need to do is, we go to an empty folder and then we say git clone on this link so, git clone and this link. What now happens is the contents of this is copied to my machine. Here I have to specify my password for my SSH identity so that is something I need to explain you later. So now go to demo, you will see here the README file and you’ll see here that is the contents of the README file. Ok now lets add the file, so you see here there is only the README and the .git folder. Please never ever touch it. So lets create another file lets say vi test.txt. And hello this is a test and now we add this to the reop. So first we of all, we say git add test.txt, and now if you say now git status. Then, we see that this file is now in the so called staging area and that is something in between your local folder and your local repository. So you have a local folder with the contents, you have a local repository, and you have a remote repository. And you personally you work with your local repository. And all the other guys, working together with you are working also with their local repositories, and you sync all your contents with the remote repository. So now we want to commit so we say, or lets do something else. Lets say we create a file test2 and how we say git add test2.txt. Now interestingly, if we now say git status those are both in the staging area. And now if we say git commit, and we say message initial commit, that is now in our local repository on this machine. And the idea is while you have the staging area, you can control which files go into a commit because the its an atomic entity in git is a commit so everything is around the commit. So you can technically control which files are going into a single commit and now what you want to do is you want to push the contents of your local repository to a remote repository. Because if you now go to this here to this git hub project, you see that there is no additional file. And we say now git push and what now happens is, I again have to provide a password. I don’t have the key manager or the key agent running, so now you see here we have committed this local change from the local repository to the remote repository. And now you can see that you have these two files here and if you click on that file you see first of all the content, and also you see which commit was responsible for adding this file. And another interesting thing is, if you are starting from scratch you can actually also do the following. Now lets delete this project and this is a bit hard just to make sure you don’t do that accidentally, so delete this repository and you have to say demo here. Oh no i think you have to type the whole thing, yes, so now this project is deleted. Ok so now lets do something else. Lets create a new repository, but now lets init the repository on my machine. Lets call it demo again, we dont initalize it with a README. We say create repository, and if were lucky github will show us how to do it. Ok lets actually do it ourselves. So lets actually get rid of the demo folder and lets create it again. And now do what they tell us, so we create README and we'll say git init. So now we have it initialized because now we have the dot git folder which you never ever should touch. And now we say git add README, but we can also say git add dot. So its adding everything which was in our folder, so its only the README.md and then we say git commit as usual test or whatever. And now we can't say git push now, if we say git push it doesn’t know where to push it because actually we haven’t told this local folder that it should connect to remote repository. That we do with git add remote add origin and that’s the URL of our project. And then we can say git push - u origin master and that’s basically it. So we have to recreate, sorry re enter the password, for my RSA key and if we are lucky and everything worked fine. We can go to the project and we should see the readme file which is the case. Ok that’s it for now! That’s the first part in the next video, I will show you how to do branches and actually also how to create pull request. Thanks for watching and see you later!
