Niiiice. If you like some feedback, while this updated file it's surely better in my opinion, I'm not a fan of those serif fonts used in examples and tables. Sure, you can make a differentiation, ie. the italics for the examples, but I'd keep the same font family.

And / or you could choose a condensed, high visible font for the tables, 'cause you also need to fit lot of info in limited space cells. For example the famous Roboto Condensed font.

It''s common to do the switch from a sans to a serif (if you used the sans as standard font) in titles, however you already did nice variations for the various paragraphs / chapters.