What are the four things to look for when you're proofreading

The correct answer is, Spelling, Grammar, Punctuation and Capitalization.

Explanation:

When a document is given to a person to go through it and see if there is any mistake in the text or the art in the document, it is called proofreading. The proofreader then finds out mistakes in the document, if any, regarding spellings, grammar, punctuation and capitalization. Proofreader not only detects the mistakes, he also corrects them where needed. Proofreading is the way to make sure that the document is free from any type of mistakes.