Your brain will never be “full”. It might feel like it sometimes, but that’s not the case. In fact, it’s largely the opposite; as you learn more, your capacity to learn expands as well.
In his book “Moonwalking With Einstein“, author Joshua Foer shares a few insights along those lines. The first is about your expanding memory:
“Memory is like a spiderweb that catches new information. The more it catches, the bigger it grows. And the bigger it grows, the more it catches.”
This leads to a few advantages, both in terms of seeing the world in a better way and remembering even more of it:
“The more we remember, the better we are at processing the world. And the better we are at processing the world, the more we can remember about it.”
Don’t be afraid to keep learning and expanding what you know. Not only will your brain never fill all the way up, but your work to learn more will lead to greater capacity going forward.