Non-metallic cable (NM) is flexible electrical cable with a plastic covering. It’s cheap and easy to work with and safe.
An arc fault circuit interrupter (AFCI) is located in the main electrical panel or a subpanel in a home. It can be reset like a standard circuit breaker.
The American Society of Mechanical Engineers sets standards for ratchet strength so it’s a good organization to familiarize yourself with for the future. Understand the difference between six-point sockets and 12-point sockets.