<p>The default display style of a <div> tag is <strong>BLOCK</strong>.</p>
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<p>The best way to horizontally center an element is to set the <em>left-margin</em> and <em>right-margin</em> to <em>auto</em> or use the <em>margin: 0 auto</em> declaration.</p>
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<p><em>Padding</em> is the space between an element and it's border ("insidey" or "indoorsy"), while <em>margin</em> is the space between that border and an adjacent element ("outsidey" or "outdoorsy").</p>
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<p><em>Fixed</em> positioning places an element in relation to the browser window, while <em>absolute</em> positioning places an element in relation to it's container.</p>
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<p>A <em>clearfix</em> will auto-size a floating element's container to match the floating element itself. Otherwise, the element can flow outside it's container in wonky ways.</p>