I have a new email course called "Logic Basics: Understanding Arguments"*, which consists of ten short lessons delivered daily by a company called Highbrow. It's a very brief introduction to the fundamental concepts of logic needed to analyze and evaluate reasoning―and, I might add, to understand fallacies.
The course is an extensive revision, especially in the later lessons, of a series posted here many years ago. Moreover, the last few lessons includes new material not covered in those posts. It's a Premium course, which means it's not free, but you can try out Highbrow's Premium service for a month for free, and the course only takes ten days! Check it out.