reply to Admirable_Discount75 at https://www.reddit.com/r/Zettelkasten/comments/17beucn/comment/k5nzic6/?utm_source=reddit&utm_medium=web2x&context=3
If you've not come across it before you'll likely find Adler & Van Doren (1972) for reading a useful place to start, especially their idea of syntopical reading. Umberto Eco (2015) is also a good supplement to a lot of the internet-based and Ahrensian ZK material. After those try Mills.
Adler, Mortimer J., and Charles Van Doren. How to Read a Book: The Classical Guide to Intelligent Reading. Revised and Updated ed. edition. 1940. Reprint, Touchstone, 2011. https://amzn.to/45IjBcV. (audiobook available; or a video synopsis: https://www.youtube.com/watch?v=Y_rizr8bb0c)
Eco, Umberto. How to Write a Thesis. Translated by Caterina Mongiat Farina and Geoff Farina. 1977. Reprint, Cambridge, MA, USA: MIT Press, 2015. https://mitpress.mit.edu/books/how-write-thesis.
Mills, C. Wright. “On Intellectual Craftsmanship (1952).” Society 17, no. 2 (January 1, 1980): 63–70. https://doi.org/10.1007/BF02700062.
Should it help, I often find that audiobook versions of books or coursework sources like The Great Courses (often free at local libraries, through Hoopla, or other sources), or the highest quality material from YouTube/podcasts listened to at 1.5 - 2x speed while you're walking/commuting can give you quick overviews and/or inspectional reads at a relatively low time cost. Short reminder notes/keywords (to search) while listening can then allow you to do fast searches of the actual texts and/or course guidebooks for excerpting and note making afterwards. Highly selective use of the audiobook bookmarking features let you relisten to short portions as necessary.
As an example, one could do a quick crash course/overview of something like Marx and Communism over a week by quickly listening to all or parts of:
These in combination with sources like Oxford's: Very Short Introduction series book on Marx (which usually have good bibliographies) would allow you to quickly expand into more specialized "handbooks" (Oxford, Cambridge, Routledge, Sage) on the subject of Marx and from there into even more technical literature and journal articles. Obviously the deeper you go, the slower things may become depending on the depth you're looking to go.