Yes! you should have your 1 - 2 tricks you know how to perform.
And i mean you know what to say, when to say, what to do, etc..
For example: if i was asked to do i trick, the answer would be YES, with any deck, anywhere, and i would do the biddle trick. But it would be MY version, with my own handling, timings, i always perform it the same way i developed during the years.
I even performed it when i was drunk, and when i watched the video (yes, i didnt remembered it), i noticed was doing the same way, without even knowing where i was, although i wasn't "speaking" very clearly and stumbling a bit.
(Sorry about that trash story)
So choose your favourite 2 tricks, modify them to fit your style, study and practise EVERYTHING and that would be yours forever.
A note about what you said: there shouldn't be "out of many", cause you don't need many tricks, yes, you can know moves and gimmicks about everything, but the difference is made about the confidence and presentation you put into magic, not about the trick itself.
A tip: choose at least 1 or 2 trick that are impromptu, so if you're given a deck you won't be in panic, then maybe choose something with a setup, that you can arrange if you have time before, or when everyone else is confused.