I installed KODI on my FireTV but I cant figure out what to watch, the interface is very confusing. Any tips?
Go here and follow the instructions to install Kodi for Fire TV and to configure it: https://www.tvaddons.ag/
You will wind up with a large library of addons that will give you access to just about everything you could want.
I use the Exodus addon to access movies and TV. There are other addons that you can use to access live sports (e.g., sportsdevil).
I also use Trak TV (free) to compile a collection of movies and TV shows that I want to watch. I can then access the same collection of movies and TV shows from every Amazon TV and firestick in my house. Very convenient.
Also, I use Real-Debrid as a tool to find sources for content. It costs $4 per month.
Everything you need to know to install and use KODI you can find at tvaddons.ag.