Single note for each idea and overall view
I may agree that having a single note for each idea can be useful, however I think that may be some drawbacks in writing a single note for each idea as suggested here. I think that in this way one may lose the overall view of the concepts and topics one is learning. I think that one should continuously switch from a detailed view of a concept (zoom in) to a overall view of a concept (zoom out) to learn something. I think that one could get both using: