When it comes to submodules, I like to use the following command:
git submodule update --init --recursive --remote
Other git commands:
git log --oneline
git log --stat # (files changed)
git log -p # (files diff)
git diff # shows the difference in files not commited
git log --oneline --decorate --graph --all # see all branchs at once
git reset HEAD~1 #( reset of local changes and the arguments is where to go when reset)
git revert HEAD # (revert commit to remote branches and the argument is the commit to be reverted)
git rebase -i start # rebase with interactive
git tag <tag_name> commit
git describe