Emacs is reasonably consistent across its major-modes in its common usage patterns and keybindings. For example, C-M-a and C-M-e consistently move you to the beginnings and ends of functions in various language modes, and C-c C-z moves the focus to REPLs and back. In read-only modes n and p move the cursor up and down, and w generally copies the path, address or URL of the buffer to the kill ring.
