Do I get to keep Game Pass games?

No. The only way to keep playing it would be to either renew Game Pass or buy the game.

Please keep in mind that if you have gamepass you do get a discount towards any purchase of a gamepass game price so it's best to buy before it's gone

No it is only tillnthe are rotated out

Best optionn just.unit if you like it

They do get discounted as rheynare gamepass titles

Do I get to keep the games if I keep up my sub till end of console

The basics of it are

Gold games that you already have are only yours while subbed and become unplayable if unsubbed, 360 games that were given with gold are yours to keep forever.

gamepass core, all previous games with gold games apart from 360 games are yours while subbed and become unplayable when unsubbed, games provided by gamepass core are only playable while they are available and while you are subbed.