intro

Read introduction to commands

$ man intro

$ man [1] intro

$ man -k intro

intro - introduction to commands

intro is an introductory man page present in each section of the manual. It provides an overview of that section's content.
Each section intro explains the types of documentation found there. It helps newcomers understand man page organization.

Section numbers in man pages:

1 - User commands

2 - System calls

3 - Library functions

4 - Special files

5 - File formats

6 - Games

7 - Miscellaneous

8 - System administration

Read-only documentation. Content varies by system. Part of man-pages package.

intro pages have been part of Unix documentation since early versions, providing orientation for each manual section.

man(1), apropos(1), whatis(1), manpath(1)