vimtutor is the starting point for learning vim, but it's fairly surface-level. To actually learn vim, you should read through the user manual by typing :help usr_01 and hitting enter in vim. It's also accessible online here: https://vimhelp.org/usr_01.txt.html#usr_01.txt.

It's a fairly quick read, about 40ish pages that are reasonably short and is intended to be read straight through like a book. It provides a good overview of all of vim's features.

Note: this is distinct from the reference manual, which is much, much larger and isn't intended to be read straight through.