In the WordPress settings tab there are four main categories of specific settings for your website. The categories are General, Performance, Writing, and Discussion. Each of these categories have very important uses. In the General tab you can change the language, add a timezone, delete your site or the most useful feature, change your domain name. Performance is the smallest yet an important setting category in my opinion due to its use for improving loading speed for mobile devices. In the writing tab there is a few settings. The most important of which being the setting to control how many posts and how many recent posts are on one given page. And the setting tab the I personally would use the most on WordPress would be discussion because of the personalization capabilities for comments and the comment blacklist.