Database testing is a sort of software testing that examines the database's schema, tables, triggers, and other components. Complex queries must be created in order to load or test the database and evaluate its performance. It verifies the accuracy and consistency of the data. If you are planning to learn software testing then I recommend you to check out this test architect master course from Intellipaat.
Also, if you wish to get started right away, you can watch the following video on Software Testing Tutorial to do so -