Note for Apply team members: This is replaced by the working with git guide; that also has details of working practices we agreed in earlier retros and can be edited by multiple members of the team (this gist can only be edited by me, so is an unsuitable place for long term team documents).
git checkout master && git pull
git checkout -b feature/ap-999-add-a-thing
git commit
git checkout master
git pull
git checkout feature/ap-999-add-a-thing
git rebase master
If there are conflicts, be very clear that you are not undoing other peoples' work when resolving them.
git rebase -i master