hsc is not a tool for beginners. It does not make html easier. It only makes it a bit less painful and brain-damaged - that's all. Therefor, these documents asume that you are already familiar with html. There exist several sources for beginners, and this won't be page #1876545 which lists these sources (But I'm frightened, the section about related stuff has degenerated to one of these pages..).
If you also want to utilize the project managment capabilities), you should also know how to work with make and write your own Makefiles.
For several other advanced topics, it is required to have some experinces with any programming language. Rexx is fully sufficient for these task, and most examples and some supporting stuff is written in this language.
As hsc is a CLI-only tool, any knownledge of how to work with mouse and icons is not required.