A modern programming language that makes developers happier.

kotlinlang

Hey everyone, new to programming and Kotlin. Trying to learn about classes and objects, and having a hard time understanding OOP concepts like polymorphism, inheritance, constructors etc.  I'd like to remake what Google has done with the FIFA World Cup summaries of match results,fixtures,list of teams with ranking, list of players with number of goals etc. I was wondering if there was a complete project that you could point me to to help me understand how everything connects together? Appreciate any advice at all