Category, sub-category and articles

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Getting started
Overview
Creating your first Notion website
Using a Bullet template
Managing content in Notion
Understanding notion structure
Managing images
Auto sync and Publish
Custom 404 page
Understanding Bullet dashboard
Navbar/Header customization
Footer customization
Logo, favicon and social share image
Custom code
Add search functionality
Setting up a multilingual Site
Sidebar
Hosting
Adding custom domain
Hosting in Root or Apex domain
Sub-directory hosting
Managing Page Redirects
Making both APEX and WWW to work
Restrict Your Site to Custom Domain Only
Membership/Content Gating
Overview
Password Protection
Email Confirmation access
Segment-Specific Restriction
Blog
How to setup your blog with Bullet
Understanding Bullet blog structure in Notion
Posts database properties
Authors database properties
Tags database properties
Blog Settings
Knowledge base
How to use the knowledge base plugin?
Category, sub-category and articles
Knowledge Base widget
SEO and metadata
SEO in Bullet
Sitemap and RSS Feeds
Liquid Syntax
What is Liquid syntax?
How does merge tags work?
Hiding blocks in Bullet
Conditionally rendering blocks
Embed HTML inside Notion
API Documentation
Overview
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Billing
Billing FAQs
How to's
How to unpublish an existing page
Add Buttons inside Notion website
Show database views as Tabs
Prevent discovery of Notion Page
How to use different templates in the same website
How to add a custom search bar
How to embed forms in Notion and Bullet?
Embedding content in Notion and Bullet
Add a carousel to bullet site
Troubleshooting
Missing pages in Bullet, Links pointing to #
Troubleshooting Bullet Block Editor
Notion table instead of webpage
Themes
Theme settings
Style Application Hierarchy

How to create Category, Sub-category and articles in Bullet

For your documentation to be clear with proper hierarchy and navigation, you can categorize it all within Notion.
In an empty knowledge base page database, each new page you create is a new category. With that page, you can create another database to create a sub-category or just fill in your info directly depending on your data simplicity.
You can create as many sub-categories and divisions with a category by simply creating pages in a database and databases within those pages, easy, isn’t it?