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The author seems knowledgeable, and the graphics are relevant. But the incomplete, grammatically incorrect, and ambiguous sentences leave the book barely readable. I understand English may not be the author's first language, but a competent editor can help with that.
I am using the Kindle version & there are exercises with links so you can practice what you read. The problem is the links don't work. When I click the link, I get "Not Found. The requested URL/jsvisually/interactive/#chapter1 was not found on this server. Additionally, a 404 not found error was encountered while trying to use an ErrorDocument to handle request." How can I use this book if the links don't work? Am I suppose to have my own text editor? With the links not working, then I can't use the book & I wasted my money.