I currently do not use any, I use to be a paper only person, but I use a kindle now. I guess I just can scroll through what is on my kindle. I kind of like h

I currently do not use any, I use to be a paper only person, but I use a kindle now. I guess I just can scroll through what is on my kindle. I kind of like how Derek Sivers does it with book notes on his site https://sivers.org/book https://sivers.org/book