I just read the 2016 bit about how you published individual chapters to gauge interest; that was pretty cool. Could I ask you a couple of questions about it?

1. How does "purchasing" a few chapters look on the user side? e.g. Do you price every chapter and they only pay for the difference if they want to purchase the full book later? Do updates (which you said they're entitled to?) come out for individual chapters?

2. How do you get the word out initially? (I see you mentioned going to conferences; it'd be nice if you could elaborate or mention if there are other potentially effective approaches.)

Thanks, and congrats on your success so far!