1. Participatory Narrative Inquiry isn't something you can learn just by reading or listening. You have to do PNI to learn how to do PNI. Of course I have written four books about PNI, but in those books I ask (beg) people to alternate between reading and doing. It's harder to ask people to do that with videos, which people tend to watch (and binge watch) in a more passive way. I don't want to make a video course that gives people a false sense of understanding or achievement. I want to get people up and moving around.
2. I'm pretty good at listening to people and coming up with helpful questions and suggestions. I'm not very good at making "canned" videos. I do make videos sometimes, but they are usually full of ums and ahs and ramblings and losing track of where I was going. Besides, it's boring to talk when nobody is listening, and I can only stand so much of it. I like talking with real people who are doing real projects. That's the fun part of this work.

Short answer:  The Courses page has a table that compares the PNI Practicum courses.

Long answer: To begin with, the Introductory course is so short and light as to be not really a practicum course at all. If you have very little time, or you have never done any story work before, or you are not sure that you want to use PNI, the Introductory course is the best course to take.

If you have done story work before, you might want to use PNI in one of two ways:

• The ancient, artisanal style of PNI is simple and clear. You gather some stories, then help a group of people make sense of them together. It's the sort of thing that could have happened (and probably did happen) thousands of years ago. If you want to learn to do PNI like this, take the Essentials course.
• The modern, scalable style of PNI is complicated and ambitious. You gather some stories, and you also gather a lot of answers to questions about the stories and their tellers. Then you look for patterns in the answers to find "food for thought" people can use to explore the topic more fully than they can with the stories alone. To do this style of PNI, you need to collect more stories, generate and review graphs and statistical test results (or qualitative patterns such as themes), prepare patterns for use in sensemaking, and facilitate a more intense and demanding form of sensemaking in which people make sense of both stories and patterns. If you want to learn to do PNI like this, take the Deep Dive course.

I know some people who do only the ancient style of PNI, some who do only the modern style, and some who do both. The ideal is to be able to do either style as the situation calls for it. But there is also an element of personal preference involved. Some people gravitate more naturally to one style or the other.

One thing that might help you decide is to look at the example catalysis report (of patterns prepared for sensemaking) that I have on my web site (it is actually some excerpts from a longer report I built for a project). This is the sort of thing you would be creating to support sensemaking in a modern-style PNI project (the kind you would be doing in the Deep Dive course). If you can see yourself enjoying the work of creating a report like that — if that is the sort of thing you want to learn how to do — then the Deep Dive course would suit you best. If that sort of thing seems boring or stupid or overwhelming to you, then you would probably like the Essentials course better.