Some people try to learn everything. The problem with this is they will never succeed.
Others learn the system and thus have access to everything, they can succeed.
As an example, you can try to read and understand everything in the library and you will inevitably fail. The alternative is you can learn how to find things in the library and everything is readily available.
You can try to learn everything on the Internet and fail miserably or you can learn how to search properly and a wealth of knowledge is readily available to you.
Learn the system, it will get you places.
Have a great day!