Designate categories as "members-only" via 'Privacy Settings.' Assign them to users via 'Profile.'

Noted That:

To install correctly this o3world-members-only-categories.zip.
Fisrt Download the o3world-members-only-categories.zip to your computer
Extract/Open o3world-members-only-categories.zip to Your Computer.
Then, Find readme.txt file inside o3world-members-only-categories.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "o3world-members-only-categories.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "o3world-members-only-categories.zip" Downloaded plugin from your computer, Where you downloaded o3world-members-only-categories.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "O3World Members-Only Categories" folder is added on left sidemenu. Now, Click on "O3World Members-Only Categories" folder.

Noted that: If you do not see "O3World Members-Only Categories" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about O3World Members-Only Categories Configurtions and Settings or How to work "O3World Members-Only Categories" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "O3World Members-Only Categories" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is O3World Members-Only Categories
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
Upload `o3world-members-only-categories.php` to the `/wp-content/plugins/` directory Activate the plugin through the Plugins menu in WordPress Within Settings -> Privacy you’ll see a new section titled Members-Only Categories. This is a listing of all your top-level categories. Tick the checkbox next to those you would consider “private.” To grant a user access to one or more of those categories, tick the checkboxes at the bottom of their Profile in a new section also titled Members-Only Categories. Only a user who can edit users (administrator) may do this. Log out of WordPress, and log in as that user. The content on your site should now be filtered by “public” and “members-only” categories.

Upload o3world-members-only-categories.php to the /wp-content/plugins/ directory
Activate the plugin through the Plugins menu in WordPress
Within Settings -> Privacy you’ll see a new section titled Members-Only Categories. This is a listing of all your top-level categories. Tick the checkbox next to those you would consider “private.”
To grant a user access to one or more of those categories, tick the checkboxes at the bottom of their Profile in a new section also titled Members-Only Categories. Only a user who can edit users (administrator) may do this.
Log out of WordPress, and log in as that user. The content on your site should now be filtered by “public” and “members-only” categories.

assign, them, users, profile, settings, privacy, categories, members, only, designate,

Name
How to add Bpmnio in Wordpress
How to add Wp Nasaads Query Importer in Wordpress
How to add Search With Google in Wordpress
How to add Discount Price For Woocommerce in Wordpress
How to add Everpress in Wordpress

Reffered: https://wordpress.org/