This will give you an overall idea about how to navigate the portal.
How to use Accessibility?
Use accessibility option to change contrast, font size of the content.
Search functionality throughout the site.
National Portal links to several G2B, G2C, G2G services. Some of them are
-Issue of PAN to a person
-Issue of PAN to an entity
-Registration in VAT
-Business Licenses Portal
You can find them from the home page e-Services section.