First, join mastodon.
Second, clone the mastodon's git repo.
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I'm looking forward to seeing what you do with the #Mastodon source code!
fwiw, my instance, @QOTO, uses [its own fork](https://git.qoto.org/qoto/qoto), which adds [lots of cool features](https://qoto.org/about/more).
@tripu For the moment I'm just reading because I'm dedicating my spare time to rust. But It is good to know that you've your own fork :)