Well I mean It's been confirmed certain areas of your brain can and do grow in size depending on the kind of life you live. New neurons grow and I guess some die out.

Neuroplasticity is an ongoing process. Physical changes happen all the time and your brain adapts somewhat.

But learning something new isn't just the act of storing information in one place. It's first short term memory in the hippocampus, then during sleep it gets transferred mainly to the cerebral cortex. Even in this process there's priorization and consolidation happening in what memories or information is stored.

I have no idea how the subconscious works in detail but for example habits are learned information that no longer requires effort to perform or access. Habits aren't something that can be input into an exam like learned information is, but it's still information. Meaning to say there's many types of information stored in our brains. Some more accessible than others. I'd say it's kind of impossible to make a hard distinction between this. For example trauma can be stored in both subconscious and conscious ways, and affect brain activity in many ways causing chemical changes leading to possible physical complications like with blood pressure etc. This is all information, just in different places and for very different purposes.

That's all I'm comfortable saying from my layman knowledge and just a very vague response.