I agree with @jack:
First, I don't need a Zettelkasten. If you're being honest, you probably don't either.
For most people, a simple notes app to store a curated selection of bits of information is more than enough. A full-blown Zettelkasten is overkill.
However, if you’re a thought leader and/or writer and need a systematic way to develop original thinking and store and retrieve those thoughts to combine them into new work, you may want to look at a Zetterkasten.