To get started with a minimalist Zettelkasten in Notion, I recommend including:

Note
This is where you will capture the body of the note itself.
Topic(s)
You can add as many tags as you like.
Note type (i.e. fleeting vs permanent)
This can be a helpful way to filter “notes in progress” or “draft notes” from more permanent notes.
Source
Add the URL, book, author, citation, etc in this field so you can easily find the original material later on.