Here is a YouTube computer tutorial about Setting up and configuring i3 gaps, and is part of a growing collection of videos I have found which should be useful to you for setting up the i3 window manager and getting it to run smoothly. There are thousands of YouTube computer tutorials out there, but this is a good one when you need setting up the i3 window manager and getting it to run smoothly.
This tutorial, "Setting up and configuring i3 gaps" is a free tutorial you can watch, which will help you understand how to get better performance, usability, and an overall better experience using your laptop or desktop computer.