What do you mean pieces? Like Laptop components? If so then motherboard,ram,cpu, and psu for a basic laptop so 4 I guess (5 if you want to include a gpu).
I’d say monthly. It probably wouldn’t kill you to do it every three months though.
Answer: WIDE AREA NETWORK (WAN)
Explanation: hopes this helps
Passwords, TPM, and Drive Encryption.
Hope this helps. :)