So you’re new to WordPress and want to add some information on your blog that will remain constant. Should you create a category or a page?

Answer: Page

Categories are like sections of a magazine. They are intended to hold regularly updating content that you want to categorize under a specific name. Pages are for content that is intended to remain static. Of course with the flexibility of WordPress you can use pages for content that will not necessarily remain static; but as a general rule, if you’re adding content to your site that’s meant to remain visible and unchanged, like an “about me” page or a “contact me” page, you do not need a category for it. How to add a page – WordPress

Let’s say you want to write a weekly restaurant review. Should you create a restaurant review page or a restaurant review category?

Answer: category

Because you will be writing weekly reviews instead of just one review about one restaurant you should create a category for your weekly restaurant reviews. It’s possible you might find a review plugin that works through a page that the plugin creates, but assuming you are not using a plugin, you will want to create a category and add your weekly reviews as posts that get saved to your restaurant review category.