Reddit, Where can I go online to learn more about operating computers? Please see text for more info.

I have an eclectic knowledge of computers. I know how to operate email, find programs and surf the internet. I know how to erase my history, and perform search functions. I know how to download programs and run fixer programs like Malwarebytes and Combofix. I take online classes successfully and can use Microsoft Office pretty well. I have had some success googling problems, and fixing them, although I have no idea what I am doing. I am 33 y/o, and not a gamer. All that I know is from personal experience over the years. Where can I go to become more adept at the inner workings of a computer? It seems like teaching programs are either very specialized or for total beginners. Please Advise. Thanks.