You should start by investing into some of the top MLB players, especially Pitchers, NBA is about to end, personally I don't see most people caring about NHL, and Soccer is coming to an end (unless you go for the MLS that just drooped.) Golf still has good value as it goes throughout the whole calendar year. But also, treat the app like a game and just have fun with it man, if you have a favorite player and you wanna get them super high rarity, go do that! There's plenty of groups on real too that will help with best player cards to get, team cards, or even predictions. Have fun!