Initially when starting this digital garden I was following my understanding of the zettelkasten practice. While researching digital gardening and similar practices I've became more enthusiastic about digital gardening. Consequently it means adopting a different approach and taxonomy of my bubbles. The taxonomy used for my digital garden follows the practice of Evergreen notes as defined by Andy Matuschak.
Much like the 5 layers as described by Tiago Forte I follow the following hierarchy, again inspired by the Evergreen practice of Andy.
Note The stages of a bubble match the first three stages of an investment bubble.