David Healey from Xtant Audio started a very extensive series of video tutorials which may help you getting started with HISE.
The discussion about the tutorials can be found here.
These tutorial goes through the process of building HISE on GNU/Linux, Windows, and OSX using the source code that can be found on the GitHub repository.
Building HISE from the source code yields two advantages:
It covers the project management system of HISE. Basically you put everything into one folder and HISE uses subfolders for each file type. David does a great job explaining all those subfolders and file types.
This tutorials covers the handling of morphing between dynamic crossfade layers (but it also shows how to load samples into HISE and use basic modulators).
An overview of the property editor in the HISE interface designer.
Exploring the widget/component list in the HISE interface designer.
Changing control properties in the HISE interface designer using JSON.
This is an intermediate level HISE scripting class but beginners will get something useful out of it too.
In this video we'll discover a method to display the name of the currently selected preset on the interface of your HISE instrument.