Visual and narrative chunking. If its just a set of facts, then I aim to establish relations between them to form chunks (even if they're non-nonsensical): e.g.

ball, hat, smelly, coffee, jump, caprice, compute, cabinet, hopscotch, calcify, amorous, read, polynomial, feast, leafy, stretch, turd, magic, cough, beat =>

[Ball in a hat floating in smelly coffee jumped], [With caprice, he computed a cabinet using hopscotch], [Calcified lovers in amorous repose read polynomials], [A feast of leafy turd stretched with magic], [Rapper coughs some beats]

If we're talking about abstractions and relations say in mathematics, then I do the opposite and force relations between objects in a way that the objects derive the relations. I aim for pithy + discriminative: e.g.

Properties of a field can be captured / derived from two overlapping similar triangles formed by vectors. Formal definition of continuity at say point c has the function defined within a shrinking positive y-gap centered about c always be contained within some positive x-gap centered about c. Cognitive function "hatred" follows attitude-type and then function type which is captured by an orbital model, e.g. center(Ni)-Si-Ne-afar(Se) where Ni-Si orbit a close perimeter of introversion and so would repel each other more than say Ni-Se (which is why these two can reach consciousness).

Note that all of this requires conscious effort. Usually, information presented in texts or lectures are standardized and verbal which does my memory no good. I'd much rather read the book and rebuild the information in my mind's eye so that they get internalized.