The Rules of AdSense Placement

You need to put your AdSense units where your users will be looking. You
need to blend them into your website so that they look like content. Those
rules are clear. But Google has created different formats of ads to suit
different areas of a Web page. There are also some general rules that can
guide you to the smart use of the various AdSense formats:
• Leaderboards should go at the top of the page.
• Squares and rectangles should be embedded into text itself.
• Vertical ads and buttons should appear on the side of the page.
• Vertical link units should be placed next to lists of links.
• Horizontal link units should go at the top of the page, between blog
entries or above and below navigation links.
• Image ads should rarely be used at all.
• Themed ads can be slotted in at holiday time.
• And Video ads should be used whenever possible।
Those are the general rules governing ad formats. They’re worth knowing
because they’re a good place to start.
They’re also worth knowing because you can’t break the rules until you know
what they are... and that’s when the fun really begins!