for improving scripting with ignition, do you have any suggestions besides inductive university and python manual?
Any special courses or books?
Any youtube videos or udemy courses?
One good source of material is Codecademy. They provide a number of lessons that introduce you to basic (and eventually more complex) python scripting. It also has reference material for other languages as well. Of course, just using Python in your free time and on personal projects will help you improve the most.
Edit: Just remember that Ignition uses Python [Jython] 2.7
Ignition v7.9 uses jython 2.5, actually.