The best website for restaurant reviews is Yelp as well as Google My Business.
There's also some other websites for posting restaurant reviews as well as looking at reviews for restaurants that you plan to eat at.
Some other good restaurant review websites are OpenTable, Zomato, Zagat, The Infatuation and Tripadvisor.
You can also look up a restaurant on Google and sometimes they'll be reviews for those restaurants on the left side of the google search page.
Some people post reviews on those restaurants right on Google Search when the listing for the restaurant shows up in a google search.