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Git and GitHub are important for software engineers/developers. To understand Git and GitHub, we have to understand version control first.
Version Control simply means how we can switch between the versions of code. With version control, we can break the code at some instance and if necessary switch back to the instance when the code was running fine. This can also be useful if you have a client who complains a lot and asks you to make a lot of changes all the time.
Git is a distributed version control system created by Linus Torvalds. With the help of git, we can control the version of the code. It is the most popular version control tool that exists. Read more about git on the official website.
GitHub is a tool that works well with git. With GitHub, we can collaborate in teams in a project. Simply, GitHub is a website or a cloud platform that helps us to host Git repositories.
Repository is the most commonly referred term in Git. It simply means a project directory.
Commit is another term that is used while using Git. When we hit ctrl + s or cmd + s(on Mac), the file gets saved to the file system. But if we commit the code, it gets saved to the git history.
Push simply refers to uploading the current local changes to the server (i.e. GitHub in our case).
Pull refers to downloading the changes that exist, from the cloud to our local machine.
Clone means duplicating a repository that exists on the server to our local machine.
To initliaze a git repository, navigate to your project directory and run the following command on your terminal or shell.
git init
After making a change to project files, if we wish to commit the changes, we have to move the unstaged/untracked files to the staging area. To do so, we add the necessary files to commit.
git add <filename>
# OR to add all files at once
git add .
Commit allows us to register the changes into git history.
git commit -m 'commit message'
To connect our local repository with the repository that exists on the cloud, we have to use the following command.
git remote add origin <link to the repository>
If we want to push/upload the local changes into the cloud, we have to use the following command.
git push origin <branch name>
If we want to pull or download the changes that exist on the cloud, we have to pull it into our local machine.
git pull origin <branch name>
Branching is one of the most important concepts in git. We generally create branches to isolate a feature from the rest of the code. For example, we might have a code running fine on a production environment. We might want to add a new feature. In this case, we cannot risk the code running in the production environment to stop working. This is when we create branches. We can then work on a new feature, complete the feature, test it and then merge with the code in production.
To switch branch that already exists in the repository,
git checkout <branch name>
If the branch doesn't exist yet,
git checkout -b <branch name>
git branch -a
git merge <branch name>
for example, you're on master branch, you want to merge it with a branch called dev, you'd navigate to master branch and then do the following,
git merge dev
To see the commit history, use the following command
git log
To exit the log, press Q.
Sometimes we might have to refer to a commit if things break. To do so, we need a commit identifier. When we do git log, we get to see all the commits that we've made including an id like e2123ndsadsadzoqm23. To switch into a specific commit, we simply use the following command
git checkout <commit id>
# example
git checkout e2123ndsadsadzoqm23
Sometimes we might have to revert our changes to a specific commit. To do so, we need a commit ID (explained above). To revert to specific commit, use the following command
git reset --hard <commit id>
# example
git reset --hard e2123ndsadsadzoqm23
Thanks for reading this guide. I want to make it a series and in the next one, I'll be talking about collaboration with GitHub among teams. I additionally will also be covering about deploying our static websites using GitHub and netlify. If you don't want to miss those contents, subscribe to my newsletter by entering your email below.