Hey, thanks for your answer.
blockchain and web3 communities don't have many posts (web3.lemmy.zip is empty)
and web3_xr weirdly is a community about the history of internet, as stated in their description.
I hoped that someone could recommand a more lively community to get started, but I guess we are still very early in the ecosystem of Lemmy.
Thanks for the recommendations anyway!
A lot of communities are empty or near empty yet, feel free to share your project resources etc.. to them; and if you don't feel so, I can only suggest you to create your own community about it :)