Which Nintendo should I buy?

Hey guys i'm thinking about buying a nintendo (but old version).

But what is the difference between nes, nes Classic and snes?

Can you play on all super Mario Bros 1985 etc. On it?

Do you have to buy such tapes where the games are on?

Where can you buy them where they are not that expensive?

How about a raspi?

NES and SNES are old game consoles.

This classic thing is a kind of new edition of the NES.

If you buy one of the old consoles you also need the games. The new one has already integrated games.

Super Mario Bros. Is included for NES and probably also in the new edition.

Ebay is a good source for old games.