Well this site is made up of a lot of people who already have a good amount of knowledge. And the people here are not teachers. And the people here have their favorite brands, and a lot of interest in specific years of sets. You can agree with this or disagree, that is what is here and available to all of us.
Doug has a very good youtube channel, he is very knowledgeable too. There are a few sites set up by people here that are also very good.
Youtube has a few good tutorials on basic electronics, and a few good troubleshooting videos too..... I watched a few of this guys stuff and I like the way he presents stuff.
http://www.youtube.com/watch?v=3EjmCWmarwE
But he is not the only one, and a lot of his stuff does not apply here, but the one above is good for us too.
I assume you watched the one I posted about rectifiers and filter capacitors a while back.... Full wave and half wave rectifiers and basically why they have a filter capacitor on them.....