Kodi is a great media player software that you can use in your Android device. You can use it for many purposes. One simple solution which a lot of users do these days is to use their old Android device as a media center to stream stuff from the network attached storage.
What is Network Attached Storage?
A network attached storage device is a Large amount of Storage which is directly connected to your Network and then you can use the files from it on any device connected to the same network.
Some people like to connect the NAS to the Internet so that they can access data over the Internet throughout the world.
Kodi on Smart TV.
Here is a simple and useful guide on kodi on smart tv which you can use. This makes your smart tv super powerful and you can stream tons of content online.