For this, You can activate Automatic Login like @Aravisian already wrote. You can find that in the Settings and there the User Settings. First, you have to unlock in the upper right Corner and then, you can activate the toggle for Automatic Login:
The Terminal Thing is a different Situation. The Passoword is asked because for Permission but when You type it in one Time and the Terminal stays open, You don't have to type it in again.