3 Things to Know About the M1 MacBook Pro 13-Inch's Lack of Upgradeability
Regarding the MacBook Pro: 1. RAM, storage, and processor are all soldered onto the system-on-chip. There are no user-serviceable internals — what you buy is what you get forever.
The only replaceable parts are the battery and trackpad, and both require professional service. Do not attempt to swap them yourself.
When buying used, check battery health first. It is the one component that will wear out and can still be replaced.