What type of posts/comments provide the most value to the fediverse?

Maybe this is a dumb question. I've always been a lurker on social media, but I really want to help the Fediverse grow, and I've never been sure of how to engage with social media communities without feeling like I'm not contributing anything of value. What types of posts/comments/interactions are most needed on the Fediverse? Also, what are some tips on becoming less nervous to interact online? Sorry if this isn't the right community to post to, wasn't sure where to ask this.