How can I quickly navigate through man pages in the Terminal
If I understood you correctly, you want to skim through manual pages more efficiently.

By default, man uses less as its pager. In less, you can use:


Space or f or Control ⌃-f to advance one page
d or Control ⌃-d to advance half a page
b or Control ⌃-b to go back one page
u or Control ⌃-u to go back half a page


You can get the full list of less keyboard commands in its manual page. If you don't like the default pager, you can set MANPAGER or PAGER environment variables to specify a different program for controlling the pagination of man pages that are longer than one screen.