The phrase "major categories" refers to the main or most important groups or divisions that something can be organized into. It represents the broad classifications or topics that contain more specific subcategories. Full definition
Below is a listing of major categories of school allocations. (schools.nyc.gov)
And if you're a big company, you're interested only in major categories, and residential real estate is one of them. (realtormag.realtor.org)
Many of these concerns won't apply if you carry a permanent life insurance policy, the other major category of life insurance offered by life insurance companies. (valuepenguin.com)