git clone /url/to/original/repo # clone fork
git remote add upstream /url/to/original/repo # add remote from original repo
git fetch upstream # fetch content from upstream (i.e., repo forked from)
git pull upstream master # fetch and merge upstream into master
E.g., send a PR from master
, PR was closed, and now want to restart from upstream's latest changes
git remote add upstream /url/to/original/repo # no needed if set already
git fetch upstream
git checkout master
git reset --hard upstream/master
git push origin master --force