A plain-English guide to limits in calculus: what "approaching a value" really means, why 0/0 is not the end of the story, and how one-sided limits and infinity fit in.
A narrative cheat-guide to the derivative rules: power, constant, sum, product, quotient, and chain rules, explained in learning order with when-to-use guidance.
A decision guide for integration: when to use u-substitution, integration by parts, trig substitution, or partial fractions, with the tell-tale signs for each method.
The recurring errors that lose points in calculus: dropping the chain rule, sign slips in the quotient rule, forgetting +C, and confusing a function with its limit.