What are some good resources for improving my poker game, especially for players in the USA?

I never thought I'd meet my poker soulmate in the strangest way possible—through poker freerolls & passwords. A buddy of mine kept raving about the free tourneys, and I figured, why not? Turns out, that night, I ended up in a heated heads-up battle with someone who played exactly like me. We started chatting, swapped Discords, and now we grind together every night. USA players, if you're looking for free action and maybe even a poker partner, this is where it's at.