Raspberry Pi is a very small computer that can be used instead of a TV-Box, just plug it into your TV, add a keyboard and voila. You can also use it in a lot of small projects, there are plenty of forums filled with tutorials on thousand ways of using it. There is no much difference between a Raspberry Pi and your PC, it can basically do as much as a PC does. For example, you can use things like spreadsheets, word processing, internet browsing, play games, Movie streaming and of course install Kodi on it.
The last version of Kodi is supported by Raspberry Pi, meaning you can just navigate to Kodi.tv official website, download and install it.
However, if you encounter any problems with installing official Kodi 18.3 app on your Raspberry Pi, there are several Kodi clones built for the Raspberry Pi that will sure work.
As an example, LibreELEC has released a beta version of its software that’s based on Kodi 17 Krypton and finally an Alpha version based on Kodi 18 Leia. You’ll need to install the LibreELEC based on Krypton or Leia onto an SD card, then insert it into the Raspberry Pi and launch the LibreELEC distro, that’s all.
There is also a LibreELEC USB creator tool, which will easy this process to minimum effort It can be used for Linux, macOS and Windows PC, just download it from the LibreELEC Krypton download web page. It’s worth repeating that at the time of writing this is a Beta/Alpha version, so there may be bugs and other issues.
If you fail to Install Kodi or LibreELEC on Raspberry Pi you can always ask for help on Forums or hire a Raspberry PI professional for a minimum fee that will help you. Get Help here.