If you’re looking for a quick reference sheet of proofreaders’ marks (and I promise, using them is so much faster than doing the corrections in longhand), here are two that seem useful: one from Merriam-Webster and one from Espresso Graphics. Both of these can be printed on one page, and they include helpful examples for each mark. Jenny Frost also recently sent me a link to her free online grammar checker that might be useful as well!
Thanks. The links were very useful to me.
Thank you – can’t believe how little information there is available (or findable) on this topic!