Avoiding errors in logic, and spotting errors in the reasoning of others, is a key proficiency in developing and supporting a point of view.
Logic and argument - Dartmouth College
A resource for students from the college's Writing Program that defines argument, explains formal logic, describes common logical fallacies, and suggests guidelines for reviewing evidence
Logic in argumentative writing - Purdue University
A resource for students from the university's On-Line Writing Lab that includes definitions of key terms in logic (e.g., premise, syllogism, deduction); common logical fallacies; and using logic well in writing
Logical fallacies - St. Cloud State University
A resource for students defining and illustrating a number of logical fallacies in each of five categories: appeals to feelings, distractions from the argument, misinformation, generalizations, and irrelevant connections