Learning comes in different levels.
Reading a book is educational, but you might read thought-provoking non-fiction and find it simple and enjoyable, or you could be reading a book to study for the MCAT and find it utterly frustrating and difficult.
You can learn to garden and find it enjoyable, but learning a new job as the CEO of a large company could push you to new levels.
Learning on the outer edges of your comfort zone, or even beyond your comfort zone, can make you want to give up. It can be difficult to ever imagine that you will be able to comfortably converse about the topic or use the information towards your objective.
But think back to a topic you once had trouble understanding?
I spent over four years working with a couple of Medicaid programs. When I first started, trying to understand the eligibility criteria was daunting. I could only take in small bits of learning at a time, before I got too frustrated and quit. With time I came to understand the programs quite well, and I definitely knew where to look for more information.
It gets easier with time, and we grow through the challenging situations. If you are at the outer edges, always remember, it gets easier.