Imactroubleshooting

How can i find a book that tells you all about
the troubleshooting for the imac.The reason
why i ask is because i run into a lot of
problems with the imac and don’t know what
to do.I sometimes end up calling a tech
person to help out sometimes.But i wanna
learn for myself what to do when i have these
problems.What can i do?Where can i go to
learn about troubleshooting mainly for the
imac,but also like to learn the troubleshooting
for the PC later on.I own a Imac os.9.Please
send me some help on this one.