New FoundryVtt Dev, I want to adapt a system, where to start?

I'm here looking for some help. I want to adapt a system I play regularly, and despite my current JS Experience, I have absolutely no FoundryVTT Development experience.

While I see the Boilerplate tutorial, I'm slightly worried because it seems a bit out of date, while I want to make that system up to date with the latest FoundryVTT versions (Aka v13 currently).

My main goal here is to adapt said system, and the wiki confuses me slightly due to how many resources seems to be made for pre v13, or even pre v12 for the main tutorial I read, the Boilerplate tutorial.

Is there anything I'm missing, any advices I could get, any useful resources to get started on this project?

Thank you in advance!
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