A nice way to get quickly familiar with how to use emacs/(neo)vi(m), understand how keybindings work and how to uncover new ones, is to go through reading/practicing the built-in tutorial. It almost plays like games.

When opening a freshly installed emacs, there should be a "Emacs Tutorial" link that can be clicked; also the keyboard shortcut `C-h t` (which is «Control + `h`, then `t`»).

There is a similar feature in `neovim`, when opened type `:Tutor` (which is «`:` to open the command prompt, with command `Tutor`»).