There are numerous sources for homeowners or interested parties to learn some basic wiring, like InspectAPedia, DIY Advice and Home Repair Center. None of these sites will give someone certification or enable them to do large complicated wiring projects, but it can help them learn how to do minor repairs and stay safe when dealing with any kind of electrical wiring.
InspectAPedia offers a wide selection of article and information about different electrical and home improvement topics. The site is free to use and gives a list of its references for anyone who wishes to read more information directly from the sources. They offer information on everything from basic wiring and repairs to volt and amp information. There is a lot of safety information available on the site that is helpful in keeping someone safe while working with electricity.
DIY Advice provides information for safety, basics and technique. The site offers information on how to splice wires, strip wire and how to join them to a terminal. These are some very basic techniques for being able to work with wire safely. Home Repair Center offers a general overview of safety procedures, but also offer links and downloadable guides that can give more information about specific projects and the tools that may be needed for numerous jobs.