How to show different content to different users

Learn web design from scratch.
Can't find a solution to the question,in what direction to dig.
There are 50 users, each have their own login.
They are divided into categories depending on their functional duties.
For example
1 category all users
2 category 40 users
3 category 20
etc.
Each user can belong to several categories.
You need to make sure that the users of each category mark content the appropriate category.
The solution preferably on a CMS, preferably wordpress
Thank you!