Pictures in a Blog - What should I know? What is aloud?

Hi there,

I know that I should use pictures I took by myself or Free Stock Images for my Blog, but I have some questions.

1. What about the other pictures? Am I aloud to use pictures I found on Google, if I name the source?

2. If I take screenshots from a movie for example and edit them, are they treated like "my pictures"?

3. Could it be a problem with such content, if the Blog (blogspot) is monetized?

Thanks a lot!

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