I saw that this morning as well. Highly recommended.
Chris’s site and presentation skills are just simply amazing. He has two main things going for him: one, he is a very talented guy with a wide range of technical skills, and two, he has excellent communication skills. He can take quite complicated technical material and present it in a straightforward manner that builds up from the basics one step at a time. He uses illustrations, sample code, live demonstrations, screencasts and language (that does not assume too much from the reader) to present his topics.
I have toured quite a few web design and development sites and very few of them match the communication techniques that Chris employs. To be honest there have been times when I have been reading some of the MODx verbiage and have have asked myself "if only this material was presented in the manner that Chris uses..."
Number 4 is my peeve "Exact details".
I forget to check back on threads a lot. After a question is asked many times I will ask for clarification on the question and may forget to not check back :-/ maybe thats my own problem tho...
It just need the presentation skills and need complete knowledge on MODX. It's not so difficult, but a time is thing that is required to ask query and reply answer to a query..