boardgames

This is why I always do research on the game before playing it. Optimally, I'll download and read the rulebook, but "let's play" videos work in a pinch. (Or if the rulebook is a bit obtuse.)

Of course, if you don't know what you're playing beforehand, then it's up to the host(s) to teach you, and it all depends upon how good they are at teaching (and how good you are at paying attention). These situations are obviously much more dodgy, so I try to at least peruse the rulebook a bit and keep it nearby during the game so that I can look up rules during other players' turns.

Finally, it does get easier. It does take time and energy to learn these more complex games, but the payoff is more interesting and satisfying game experiences. Every time you play, you learn a little more. Of course, if you aren't getting any enjoyment out of it at all, you might want to stick with lighter games.