How can I reset my password with "reset password"?
Typing reset password on the terminal will not reset the password.

reset is a command to initialise the terminal, and takes a terminal type as argument. Typing reset password will only generate an error:

$ reset password
reset: unknown terminal type password
Terminal type?


The command you are looking for is resetpassword (without space): see https://discussions.apple.com/docs/DOC-4101


boot in recovery mode (press command+R during boot)
open a terminal (Utilities, Terminal)
type resetpassword