$ vimtutor

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.

It depends on your distro. It could be sudo apt install emacs or sudo dnf install emacs or sudo pacman -S emacs, etc.