My usual workflow to rebase a stacked set of feature branches off of main is:

    git checkout main
    git pull
    git checkout feature-branch-1
    git rebase -i -
    git checkout feature-branch-2
    git rebase -i -
    ...

There's most likely a more efficient way to do this, but I find that referring to the most recently checked-out branch with a single hyphen is a lesser-known feature, so perhaps it will be helpful :)