The New Logic Classroom
Elihu Carranza has redone his excellent website, The Logic Classroom. Check it out.
“In conclusion, the student should remember, for the rest of his life, that if he is logical, he will never go wrong — unless he starts with false premises. Logic will not guarantee the truth of the premises, but without logic no progress is possible.” (Gordon H. Clark, Logic, The Trinity Foundation, 1985, p. 116.)