1. Find a good blog post that you WANT to talk about that way it is easier to make a great comment.
2. If you see something you like on the blog don't be afraid to tell them that they did a good job. If you see something a little off that make sure to tell them just DONT be rude about it.
3. Make sure to give reasons why you like the blog don't just say "I like your blog" make sure to explain yourself.
4. If you don't want to be mean but there is stuff you would like for the blogger to fix than do two stars and a wish
5. ( This is a extra thing ) to get more people visiting your blog add the link to it in the comment so they might be able to leave a comment back to you.