i3 isn't really a Windows click-click-click style UI; you do most everything with the keyboard, including % based resizing, converting tiles to tabs or stacks, moving tiles from one section or virtual desktop to another, etc.

It's really quite a powerful and easily configurable tool, so much so that I consider it to be an absolutely indispensable part of my day-to-day computing experience (working on a Mac, for example, is just depressing in comparison).