This document outlines different types of errors language learners can make and provides guidance on correcting errors. It distinguishes between slips, mistakes, and errors and recommends only correcting errors that cause communication breakdowns or occur during accuracy practice. The document advises having students first try to self-correct or have peers correct before the teacher intervenes. It provides examples of correction techniques like gestures, direct correction through echoing or reformulation, and ensuring students understand the correct form.