I don't know how to make a great comment because when I do cheetah tells me there might be similar ...

Ok NO!

Cheetah tells you when a substantial amount of your post or images are copied directly from somewhere else on the Internet.

If you read something interesting on the internet and you want to share something about it, great! The way to do that is to say something about it in your own words (not words copied from the site) and include a nice link to the original content.

A good way to come up with your own words to use is to search the topic of your post and see what a few DIFFERENT people have said about it, then using them for inspiration say something of your won about it. How does it make you feel? Why is it interesting?

I hope this will help you to make good posts and make money!