Students interested in linguistics or computer science, or who are taking a symbolic logic class, will find value in the material on "Basic Concepts in Propositional Logic", "Common Valid and Invalid Argument Forms", and "Introduction to Fallacies", since formal reasoning is an important part of these programs.

You can find this content in Parts 2 and 3 of video course #1: 

Note that even if you're not interested in formal reasoning as such, some exposure to concepts in formal logic is important for overall "logical literacy".

For example, this is where we define useful concepts like "consistency", "contradiction", "necessary and sufficient", as well as the concept of logical entailment (if we assume that statements A and B are true, (i) what other statements must be true?, and (ii) what statements couldn't possibly be true?).

Understanding this vocabulary, and the concepts associated with it, helps us to develop analytical reasoning and communication skills.

It should be admitted up front, however, that analytical reasoning skills are only a part of overall critical thinking skills, and most of formal logic is not all that relevant for everyday critical thinking purposes. 

This is why I only focus on basic concepts here, and not on developing the formalisms and proof techniques that one traditionally sees in courses on formal logic.