One thing to remember is that certain app aren't "Officially" supported by Kodi. Those are the ones, well are known for pirated stuff. If you roam the "Official forums" they don't condone such apps. For legal purposes, morals, who knows.... It's not hard to find those apps though.
I bought a couple boxes (Q-box) off amazon for $25 and it came with 16.0 kodi(with all the goodies) and android 6.0. Quad core with 1gig memory and 8 gig storage. Wi-Fi. With an Micro SD slot for additional storage. USB for keyboard or you can watch/add stuff from a USB drive. For $10 more you can get one of those little keyboards like pictured above. Otherwise it only comes with a remote. They are tiny, like about 1/2 thick and 3"x3". Hook it up and enjoy many apps including Exodus and more. For the price it's hassle free.
Kodi itself is easy to install. After that it's installing a 3rd party app installer and off you go... Find the apps and load them up.