In a writing workshop, what should you do when you don't know how to correct errors or mistakes pointed out by a peer?​

A crucial issue for any teacher is when and how to correct students' English mistakes. Of course, there are a number of types of corrections that teachers are expected to make during the course of any given class. Here are the main types of mistakes that need to be corrected:

Grammatical mistakes (mistakes of verb tenses, preposition use, etc.)

Vocabulary mistakes (incorrect collocations, idiomatic phrase usage, etc.)

Pronunciation mistakes (errors in basic pronunciation, errors in word stressing in sentences, errors in rhythm and pitch)

Written mistakes (grammar, spelling and vocabulary choice mistakes in written work)

The main issue at hand during oral work is whether or not to correct students as they make mistakes. Mistakes may be numerous and in various areas (grammar, vocabulary choice, the pronunciation of both words and correct stressing in sentences). On the other hand, correction of written work boils down to how much correction should be done. In other words, should teachers correct every single mistake, or, should they give a value judgment and correct only major mistakes?