If you deem .org to be sufficient and want to use Emacs¹ itself, there is an extension for the zettelkasten method of note taking that you might find useful.

1: Despite originating with the Emacs community, .org files are recognized by many (most?) IDEs, but I’m not sure if extensions are regularly ported to non-Lisp editors.

This is a mandatory comment about Emacs’ org mode since .org files are extremely similar in syntax to .md and can be interconverted extremely easily.

“Eggonomics” is rattling Americans. Eggs are now so valuable that they have been targeted by criminal gangs. Last month, 100,000 eggs worth $40,000 were stolen from a trailer in Pennsylvania. At current prices, that’s roughly the equivalent to an American football’s weight in gold.

This paragraph feels like an excerpt from a satirical dystopian fiction essay written by a middle schooler.