If we are talking about the most used languages then we are talking about object oriented programming.
OO is pretty hard for newcomers to wrap their head around.
Hell I still have my difficulties with it, really trying to find the "right" way to solve the problem I have.
Just try to get the concept, and know that there are certain patterns you can use for correctly structuring and architecting your code. E.g. factory pattern, dependency injection, observer, etc.