In your Gmail account, you will have 4 tabs on the top by default: Primary, Social, Promotions, and Forums. You can hide some of them if you do not like them. In this article, we hide the "Promotions" tab as an example.
Step 1: Log in to your Gmail account (please refer here to open one if you do not have an account yet);
Step 2: In the Gmail account, click the "Setting" button from the right-top corner;
Step 3: Click the "See all settings" command from the settings drop-down list;
Step 7: Uncheck "Promotions" in the "Inbox" tab;
Step 8: Click the "Save Changes" button at the bottom.