On the third day, I learned the following things about GitHub.

Click on the plus button to create a new repository.
git remote add origin repo-copy/link.git will add the local storage or the origin into the remote server.
git remote -v will give the links of all the repositories from where the data was added or is to be added.
When the repository is first created, git push origin branchname will push the data from the branchname and upload it on GitHub.
Click on the commit link to see the history of commits.
Click on the fork button to make a copy of someone else's repository in your own account.
git clone repository-link.git will download the repository data into your local storage.

Origin Repository

The copy of the repository that is forked from someone else's account and now it is present in your own account will be called origin.

Upstream Repository

Upstream is the original repo that you have forked from an original account.

git remote rm origin will delete the origin data form your local repository.
git remote add upstream original-repo/link.git will add the data of the original repository.
git push origin branchname will send a pull request to the upstream account from the origin account so that upstream could merge those changes into itself.
In the pull request section, Merge pull request option will be appeared so that the owner of the repository could merge the requested data into itself.
git fetch --all --prune will fetch all the data from the upstream or the original account and transfer it to the origin account or a person's repository who forked it. Prune means that only the relevant data will be fetched.
git reset --hard upstream/main will delete all your local changes to main.
git pull upstream main will fetch the data from the upstream and delete all the local changes also.
Merge conflict will arise if there are multiple changes are committed on the same line.

Explaining it in a video

Here you can get an explanation in a video. 3/60 Day of DevOps Challenge

Provide feedback