Answer:
Usually you can scroll down to the bottom of the page and see it listed with the copyright stuff, and you can evaluate their credibility by seeing if they are well-known or qualified to write about whatever subject they discuss. For example, a credible source for learning about the brain would be an article by doctor, or better yet, a neuroscientist. Also, you can evaluate their credibility by seeing what year the website was published or updated, because information can become out of date.
Step-by-step explanation:
I hope I answered your question! If not, feel free to ask me any questions :)