Calling for Resources for Learning Common Skills
(slrpnk.net)
This community is primarily structured around the sort of subjects you would see in an academic setting, but learning skills is absolutely within the scope of this community. If you have any, please consider commenting with free resources and advice for things like playing an instrument, learning a language, woodworking, etc.
For woodworking with hand tools:
You can't go wrong with Paul Sellers.
For printed materials, there is Christopher Schwarz and his Lost Art Press. Obviously, the books aren't free, but his first in the "Anarchist" series transformed my approach to my hobbies, not just woodworking.
The YouTube channel Frank's Workbench has a lot of great stuff, too.