📺 https://youtu.be/nu6kutpiHLE
Absolutely, eventually everyone must learn the git command line. There are just things you really cannot even do from even the best GUI equivalents. Plus learning the command line git properly (from man gittutorial) is the bible and will remain true forever on anything. GUIs tend to come and go and change.
By the way, you really should master gh as well (the GitHub Command line utility).