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Well as dumb as it sounds, I'd say it's probably best to just read the code that you're interested in (I was never a big friend of schematic overviews anyway, they're often not in sync). Otherwise something like this is always a starter for newcomers: https://github.com/LemmyNet/lemmy/issues?q=is%3Aopen+is%3Aissue+label%3A%22extra%3A+good+first+issue%22