If I am about to start a computer riepar company. Are there any good sources (books, tutorials, websites, etc.) that would allow me to expand my knowledge in this field? The person who I am starting this with recommends to just learn it as I go, and doesn't recommending getting certified through formal training. I have moderate knowledge of computer riepar, all self taught when I was in high school. But I'd like to feel a little more solid on my skills before starting this up.