Using Shell

Console

Switching to console mode: ctrl+alt+f2
Switching to GUI mode: ctrl+alt+f1
ID: chronos
PW of chronos/sudo: same with hostname (ex: wayne-os-1q21)

Terminal

First, you need to login in GUI or enter Guest Mode.
Opening terminal: ctrl+alt+t
Opening shell: crosh> shell
PW of sudo: same with hostname (ex: wayne-os-1q21)