You can choose to read the documentation online, or download your preferred version of the documentation. Your not forced to a PDF if you don't want them (you prefer html version which is really a better choice for technical documents, not PDF)
When you install mysql server you also get the full documentation installed also.
Perhaps no one looks in mysql/docs but they are there
Save your $10.00 for a more worthwhile expense, like food and water
first off you don't have to buy anthing. Secondly, I posted this as an online resource which is free. you just click on each section and it tells you what you need to know and it does it in a way that most "Newbies" can understand it. The mysql docs are great and a huge source of information that I use all the time. They are just alittle harder to get through in my opinion.
so if you're main gripe was that I posted a "pay" resource then set your mind at ease.. it isn't. You only have to pay to download the PDF version. Which is not something I do anyway. I think most people would rather jump online for a quick reference than sort through a PDF doc anyway.