Mac technical resources

im not entirely sure how to ask this question....but basically im looking into taking a class at a local technical college to get mac technical and software course and then take an apple certification course to potentially get a job with a local apple service center.
But i wanted to find some books or websites/PDFs with technical knowledge and how to fix most of the mac products, software issues, and anything that might enrich my knowledge and try to learn some techniques and information.'


any ideas or suggestions would be great

thanks !!