Corrections are usually made on a Word file using Track Changes, with all corrections and comments visible. All you have to do is accept or reject the changes. Watch this video for a helpful guide on how changes and comments are made and how to accept and reject changes using Track Changes.
I can also work with Google Docs, PDF files (using the commenting tools in Adobe Acrobat Reader), or pen and paper.
If you tell me the target publication, I will consult with its author guidelines while I edit your manuscript.