These communities are great places to ask questions, share your practice, and learn from people who have been at it for a long time. Even if you don't feel like participating, there are years of past conversations to search through, packed with great advice no matter what stage of practice you're at.
This is one of the most active online communities I’ve found where people are engaging with serious practice and discussing a wide range of topics, from concentration and awareness to insight practices, all aimed at awakening. The sidebar is also packed with great resources and info.
One of the most in depth practice communities online, with people from all traditions and experience levels sharing openly about the highs and lows, and technical details of what’s happening in their practice. The focus here tends to be more about the deep end of this work, people practicing on retreats, and working through various stages of the awakening process. It can get quite technical and esoteric, but there’s a huge amount of knowledge here if you’re willing to dig through past threads.