In plain emacs you can do
- 'C-h m' to show help for current major and minor modes and their commands
- 'C-h b' to show all key bindings
- after prefix command 'C-h' to show bindings starting with prefix
If you use which-key it will display the available keybindings on minibuffer and after prefix command 'C-h n' 'C-h p' will be used to change pages on minibuffer, to show bindings for prefix like plain emacs you will need 'C-h h'