- Ask the author what they would like you to look at specifically. Some people might just want you to look at spelling, some might ask you to look out for a whole range of stuff. If you start 'fixing' things beyond what the author has asked for, you are only going to upset them.
- The author has the right to reject your suggestions. That is all they are, after all: suggestions. It is the author's call as to whether they want to implement your feedback, and if they don't that is something you have to accept.
- Always be kind and constructive. This one speaks for itself, really.
- Only offer concrit if it has been explicitly asked for.
- Be kind.
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