In Vim, a tab page is a container that can hold a collection of windows.
:edit: vim doesn't automatically create a new tab.
Instead, it creates a new buffer and loads it into the current window.
set the working directory locally for the current window, not to the current tab page. a tab page can contains one or more windows.
Opening and Closing Tabs
Switching Between Tabs
Tabs are numbered starting from 1. We can goto tab{N}.
Rearranging Tabs
rearranging tab pages. [N] is 0, the current tab page is moved to the beginning. omit [N], the current tab page is moved to the end.