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In order to spend from a M-of-N multi-sig, you need to provide at least M signatures using any M public keys (from the N total). Even though P2MS is not used nowadays, it's simple and neat for learning about multi-sig:
https://learnmeabitcoin.com/technical/p2msSo what you're saying is if I have a total of 5 signatures, I can use just 1 key? What does the M stand for? Thanks for the link, but I'm a bit worried about learning it if it's not used nowadays, kind of just learning about history of something to me.