Welcome to the forum Amanda 
I love it here because it is so friendly and open and positive, I’m really glad you’ve picked up on that already 
By all means, just jump in and comment on any topics you’re interested in.
If you want to start out by dipping a toe in, you could start with ones like What music are you listening to right now? or maybe one of the games, but you’re welcome anywhere 
Memes, and the What cheered me up recently topic is a lovely one too 