I’m constantly learning new things and for lifelong learners our cognition toolbox is as accomplished as our wrench toolbox.
I find the reMarkable2 tablet, xMind, and OmniOutliner should get any job done.
A great way to co-relate key concepts in a deep knowledge subject would be the Cornell Note-Taking Method. Remember that when the brain writes things with hands, and further your own handwriting, it is a bigger “commit” in the brain and thus still the premiere concept and recall tool.
Here’s how to do it.