What are some proofreading techniques?

Some of the proofreading technique that worked for me are:-

• It is a better practice to take a print out and do the proofreading rather than on a laptop and then read out loud so that ears can hear what the writer is speaking.
• Punctuation mistakes are the most common mistakes. Checking the punctuation is essential
• One practice which I do is read backward once.
• Cross-checking the number in the article