Kate is a basic GUI text editor that can highlight syntax, suggest options and do other things useful for code and configs. Comes with KDE (which is a common newbie recommendation) and is available as Flatpak everywhere else.

But sure, there are instances where you should use CLI text editors. If you need to edit text files as root, this is generally the best option. Also, it's the only option for headless setups and SSH. For that, nano will do.