Note taking by concepts

Hi guys, can you give me recommendations of storing knowledge by concepts? Its exist a method for this?

I am taking notes in two ways, the first one is by concepts where I store the “processed” information by its category. And the second one is my classroom notes, but I’m noticing some problems in these two methods, they are:

  1. Limitation with time to revise a note and transform in a concept
  2. Problem in managing multi-discipline content
  3. Separating for concepts tend to be messy in some content (can be because of my swallow understating of the content)

So if you know a good system that I can use to substitute this, I am all ears :smiley:

Obs: some pictures of my file tree


Classroom notes

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