The honest take
If you only have time for one thing: the Databricks blog is the irreplaceable primary source. Everything else is downstream synthesis of what they publish there.
If you have time for two things, add an aggregator on top so you're not also reading dbt's blog, MLflow's blog, Delta Lake's blog, three YouTube channels, the GitHub releases pages, and r/databricks separately. That's the gap brickster.ai exists to fill — most weeks, the digest catches things the official blog didn't cover (ecosystem GitHub releases, DAIS talk drops, community-thread patterns).
If you have time for three, add r/databricks. Production-reality voices that aren't paid by Databricks to be positive about the product. Counter-balance.
That's it. Skip the rest until you have a specific need (MLflow blog for ML deep-dives, DAIS playlists for keynote replays, Stack Overflow when you hit a specific error).