Thanks for letting us know, Luckily I haven't installed any mods yet but it's nice to know that people look out for each other! <3 no homo
-Vixxy ;)
You get trading cards by playing games, or purchasing in-game items or purchasing off the market. Then go to badges section and you will have the option to craft a games bade if you have all the trading cards for that particular game.
Thanks, Vixxy :)