Perhaps you’re reading this post, don’t know much about HTML and CSS, but want to start. Many if not most would recommend some sort of online tutorial. Based on the sample chapter I’ve read and reviews elsewhere, check out this book first. Gorgeous work and $15 on Amazon.
Granted it’s true 99% of technical books out there are outdated within seemingly a day after their publication. Yet the raw basics of HTML and CSS – markup, attributes, layout – are fairly timeless. I expect this book, for this reason and with its shallow learning curve, will last on shelves a lot longer.