There's a lot of dross on the internet, but there's a lot of good material, too. Some of it is for free and other stuff requires payment and unfortunately, there's no guarantee that paying gets you something worth having.
A pay site I think is worth looking at is Lynda.com. The site provides training videos on an incredible range of subjects, and in my experience, the presenters know what they're talking about. It's a subscription service, but you can sign up for as little as a month. The cost per month is less than a decent book.
They offer a brief (7 days, I think) free trial, so if there's something you've wanted to learn, try them out.
Anyway ... they do actually offer stuff for free. One such offering, and one I can thoroughly recommend is The Practicing Photographer presented by the excellent Ben Long.
The individual videos aren't very long; I'd say 15 minutes is the average, and they cover a huge range of topics. I'm not quite sure how long they remain free on Lynda, but I think it's a couple of weeks before they drop back to subscription only. The current video (as I write) is one he did with Steve Simon on the value of photography books.
Check it out!