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Re:Learn X by Doing Y – A project-based learning search engine by RhodoYolo on Tuesday January 12, 2021 @07:53PM (#25756433)
Couldn't find any Arduino projects but i wanted to contribute. After a quick google search, I found this:

https://create.arduino.cc/projecthub

Which seems to be a narrower mindset of the OP's vision. Should i link that page or pick a couple projects?

Re:Learn X by Doing Y – A project-based learning search engine by aquadzn on Wednesday January 13, 2021 @05:05AM (#25760172)
I didn't know about this site, it's nice. If I can, I'll try to scrape it and add some Arduino projects.
Re:Learn X by Doing Y – A project-based learning search engine by aquadzn on Wednesday January 13, 2021 @09:58AM (#25762726)
just added the first 10 tutorials pages from this website