I identify the following mistakes: spelling, punctuation, grammar and typesetting errors.
Check that the correct font, font sizes and line spacings are used.
Verify and query factual errors.
Work to prescribed style guides.
Ensure that page numbers and headings, etc. are consistent.
Proofread, correct and revise text.
Amend formatting in line with Style Guide.
Provide suggestions to rewrite a section completely.
Suggest improvements to develop the voice of the text.
Every brief is different. Rates are dependent on the length of text, turnaround time and type of editing required.