I developed and currently teach a training course called “Visualization Basics with ParaView”. This course is advertised through the University of Leeds OD&PL which used to be called SDDU. The website is stilled http://www.sddu.leeds.ac.uk/ but will soon change.
The course is designed for postgraduate students and researchers. It is a hands on course that encourages users to “break” ParaView and by doing this they learn how to fix it and develop a deeper understanding of visualization. At the end of the course the students are encouraged to visualize their own data. This course is difficult to replicate with the course slides alone, you need to attend.