The first rule of choosing a desktop Linux distribution: User, know thyself
On a regular basis I use five different Linux different distributions. Over the decades, I've used pretty every much every major Linux distribution out there... and I haven't even touched more than 10% of all available Linux distributions.
If I, who've made something of a career of tracking Linux, can't keep up with all the distros how can you?
Honestly, you can't. No one can.
So how can you find the right Linux for you? This handy, dandy guide will help.
But before I dive into the distributions, let me kill a few myths. First, Linux is not hard to use. You don't need to know how to use cryptic shell commands or be a programmer to use desktop Linux. Anyone, and I mean anyone, can use it.
There are also lots of applications and games you can run on Linux.