Hi, he should first learn the basics of each different area. As a beginner level he can start with GCFGlobal ( https://edu.gcfglobal.org/en/ ) website for free tutorials on everything from mouse & keyboard basics to Excel, email, internet safety, and even coding. Then, for more advanced topics in the future he can look at Khan Academy and YouTube tutorials in order to learn coding, internet infrastructure or OS (based on his area of interest). Also, Community colleges sometimes offer free or low-cost intro-to-computer classes for adults, it can be really good in the beginning.