More closely associating new ideas to one's own personal life helps to create and expand the context of the learning to what one already knows.
Within the context of Bloom's Taxonomy, doing this shows that one understands and is already applying and even doing a bit of creating, at least internally.
Should 'understanding' come before 'remembering' in Bloom's taxonomy? That seems more logical to me.
Bloom's Taxonomy mirrors the zettelkasten method
(Recall Bloom's Taxonomy: remember, understand, apply, analyze, evaluate, create)
One needs to be able to generally understand an idea(s) to be able to write it down clearly in one's own words. Regular work within a zettelkasten helps to reinforce memory of ideas for understanding and retention. Applying the knowledge to other situations happens almost naturally with the combinatorial creativity that occurs within a zettelkasten. Analysis is heavily encouraged as one takes new information and links it to prior knowledge and ideas; this is also concurrent with the application of knowledge. Being able to compare and contrast two ideas on separate cards is also part of the analysis portions of Bloom's taxonomy which also leads into the evaluation phase. Finally, one of the most important reasons for keeping a zettelkasten is to use it to generate or create new ideas and thoughts and then write them down in articles, books, or other media in a clear and justified manner.