How do you learn to play piano and guitar? How do you learn French and Spanish? How do you excel at football and soccer?
Anytime you're learning two distinct but related things, there are at least two important aspects to the process. The first is to learn and practice each thing on its own. The second is to look through that thing to the deeper, common body of knowledge, and to appreciate the thing's relationship to that knowledge. With piano and guitar, that knowledge is obviously music. Once you have a solid understanding of music the process of learning a third or fourth instrument becomes easier. The same is true for languages, sports, and even object oriented frameworks.
Most any object oriented application framework will have a set of data storage classes, a set of classes representing things that are drawn on the screen, and some way to make those two groups work together. There will be inheritance hierarchies, containment hierarchies, and command/control graphs. There may be classes for modifying other classes, communicating with the world beyond the framework, and so on.
These common features are called design patterns, and they are the deeper knowledge behind object frameworks. Each one has a name (sometimes several), and most of the well-known patterns are catalogued in the book Design Patterns. It can be difficult to learn about patterns in the abstract, just as it's more difficult to learn music theory without the concrete experience that comes from playing an instrument. Once you've gotten some experience with one or two frameworks, though, learning about design patterns leads to a string of "aha!" moments as you recognize the patterns you're reading about in the framework(s) that you already know.
So, keep at it, look for commonalities between the frameworks that you're learning, and at some point spend some time learning about the patterns behind the frameworks. That knowledge will give you a deeper understanding of what you already know, and it will also guide you and help you know what to look for or what you might be missing as you learn a new framework.