What is i3-gaps?
i3-gaps is a fork of i3wm, a tiling window manager for X11. It is kept up to date with upstream, adding a few additional features such as gaps between windows (see below for a complete list).
How do I install i3-gaps?
Please refer to the wiki.
Where can I get help?
For support & all other kinds of questions, you can ask your question on the official subreddit /r/i3wm.
Note: In order to use gaps you need to disable window titlebars. This can be done by adding the following line to your config.
# You can also use any non-zero value if you'd like to have a border for_window [class=".*"] border pixel