The most technical pages are the ones covering TinyTIM programming commands (also known as Commands, @Commands, and Functions), which consist of an explanatory paragraph, one or more examples, and perhaps even a jibe or a pleasant chide. These pages usually cross-reference lots of other pages as well.
For additional help, there are indexes of groups of related programming commands, so that you're not hunting around trying to see what matches with what, or finding out the hard way the differences between @Listen and @Sound.
There are concept pages, which cover general programming concepts, such as creating rooms or objects, or customizing the programming environment. They also discuss many aspects of TinyTIM Culture, such as what The Clock On the Wall is and how to tell good espresso.
The best starting place would be at the main screen, which has all the sub-headings neatly laid out for you.
Or head back to the main Help page or get started searching.