Steps to sync a forked repository

sync a fork.txt

// Check if original remote repository is already added or not
git remote -v
// Output
origin https://github.com/YOUR_NAME/REPO_NAME.git (fetch)
origin https://github.com/YOUR_NAME/REPO_NAME.git (pull)
upstream        https://github.com/ORGINAL_USER/REPO_NAME.git (fetch)
upstream        https://github.com/ORGINAL_USER/REPO_NAME.git (push)
// If it only shows origin, original remote repo is not added

// If not, add it
git remote add upstream https://github.com/ORGINAL_USER/REPO_NAME.git

// Get latest changes from original remote repo
git fetch upstream

// Merge those changes to local branch
git merge upstream/main
// Change main to original users branch name

// Push changes to your remote repo
git push

// If any more help is needed, check https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/syncing-a-fork