There are many excellent guides and references online for basic, “core” HTML and CSS. But for more intermediate and advanced topics like media queries and CSS3 based transformations, most great articles tend to be comprehensive yet very narrow in scope. This extended tutorial guide set up by developer Shay Howe and others is different; you’ve get a really nice starter introduction to a broad range of HTML and CSS topics.
One small quibble though; I’d argue the second lesson on “detailed positioning” is content that should be in a basic or starter tutorial, not a guide labeling itself as advanced.