Both the Flying Pigs QRP Club and Elecraft mailling lists had messages with links to free electronics courses:
- Rob W0JRM pointed us toward the free-ed.net electronics courses.
- Ron WB3AAL sent a link to the courses offered by OpAmp Electronics.
Both sites offer tutorials on basic electronics. The OpAmp Electronics site also includes a number of exercises that step you through “experiments” designed to help you understand the concepts. Neither site covers RF topics, but if you’re looking for basic electronics theory, either of these looks like a good place to start.