I chose them based on what I've come across and searched for, and comparing several videos of the same type. The carpentry videos were some of the earliest ones

I chose them based on what I've come across and searched for, and comparing several videos of the same type. The carpentry videos were some of the earliest ones I added so my process may not have been as good then. Of course, I'm not an expert on all of these subjects. I've done my best to get things off to a good start, but ultimately the idea would be that people with more knowledge than me add videos on things they know about.