Some instructors might ask you to not use any web sources for your assignments, but Google searches and websites are useful tools! We use them every day, so we might as well learn more about them.
How do you decide if something is reliable or not? Sometimes we can tell a website is untrustworthy just by looking at it: there might be a bunch of weird and scammy ads. Sometimes the information on the website is so outrageous and biased that we can tell the author isn't trustworthy. But most of the time it's difficult to tell what you can and can't trust.
You can use something called the CRAAP Test to tell if a website, or any other type of source, is credible or not. CRAAP stands for:
I've linked the CRAAP Test handout I gave out in class on this page. It has a bunch of questions you can ask yourself about a source that will help you evaluate it.