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Most of the tips in here are definitely true, tabbing and doctype and semantics but others are not set in stone, for example sometimes javascript can be listed outside of the head section, and non external css can be okay at times. Moreover, I use php to write fresh js and inline styles for my version of the flickrRSS plugin

Without getting bogged down in semantics, my old theme that I abandoned because I couldn’t make the sidebar and content pane work together…. it could have been saved, and my current theme could have been altered somewhat as well. While I prefer my current theme right now, it does bug me that something so tiny, would have fixed what I ended up throwing away.

Using the handy dandy, guide on the clear property from the w3schools the clear property can be summed up thusly:

Image and text elements that appear in another element are called floating elements.

The clear property sets the sides of an element where other floating elements are not allowed.

Or to put it another way, you basically create a page break at the bottom of an element, right, left, or both. This is one of the reasons I want to go into this line of work, it really excites me to have learned this, and everyday I find something like this that I did not know.