It is important to write in your own words

You should never just copy and paste something from somebody from somewhere into your own note taking system. Coming up with your own ideas with your personal spin on a topic is all the more valuable.

Having thousands of copies notes in a system is essentially just a really mediocre Wikipedia clone. But saving ideas in your own words will Enable your future self to learn from your past self - because your future self will forget everything.

There is no real advantage in the knowledge that is readily available on Google or the internet.

Niklas Luhman himself kept two different kinds of notes: "Literature Notes" (were he wrote notes about books he read) and "Zettelkasten Notes" (where he wrote his own thoughts). Andy Matuschak writes of “messy-thought” inputs, which will be used as building material for "neat thoughts". They all go back to the principle of differentiating between "Fleeting Notes" and "Permanent Notes", all written in your own words.