As an example, I will use my fork of the LaraSail project.

As of the time being, it is 9 commits behind. In order to get started, you need to do is to clone your fork. You can do that by going to GitHub and clicking on the Clone button:

Once you’ve copied the URL, go to your command line and run the following command:

git clone git@github.com:bobbyiliev/larasail.git

Note: Make sure to change the link so that it matches your forked repository

Once you’ve cloned the repository, cd into the directory:

cd larasail

Then add the original repository to your fork as an upstream:

git remote add upstream git@github.com:thedevdojo/larasail.git

Note: change the details to match the original repository

After that, fetch the latest changes from the original repository:

git fetch upstream

The next thing that you need to do is to pull the latest changes in order to get your fork up to date:

git pull upstream main

This could be considered as an optional step, but the last thing that you need to do is to push those changes to your fork on GitHub:

git push origin main

Note: make sure to change main with the name of the branch that you want to sync with.

After that, if you go to your fork in GitHub, you will see a message saying This branch is even with the_origin_repo_name:main.

I hope that this helps!
Regards,
Bobby