Very brief Steam adventure

Yes! Get CS:GO on Steam. I also highly recommend Firewatch because I like open-world mystery games.

Steam has a plethora of games, more than some of us could even imagine. And for a place with soooooo many games, it's gotta have a community with soooooo many people. I believe there's at least one person per game who's like a complete god/expert at the game, probably after playing that game for so many years >.<

I don't use STEAM much, probably only got Undertale and that's it >.>

Don't worry dude, the large number of games to choose from is why it's so amazing! First of all, take a look at the Free-to-Play games (some real gems, like Team Fortress 2) and the ones on sale (generally if there's not a big summer/winter/halloween sale, only buy a game if it's 80%+ off). You can also sort the games by reviews, so stuff like Portal, Garry's Mod and BattleBlock Theatre will come up. Just take a bit of time and look around at the games, see what you like and before you know it, you'll love it. There are some great PC exclusives, indies (better on PC than 3DS) and 3rd party games (that you won't really be able to love on Nintendo consoles, unless it's LEGO).

Don't keep Steam. It's a control freak system >.<)/