What is your best Adsense tip?

content:I am always asked "what is your best Adsense tip?". Here is my five best and most important Adsense tips:

- Less internal and external links on the page

- Having the ads with the same background color as the page background

- Having ad links color blue (the default color of hyperlinks in html)

- Having one leaderboard 728 x 90 text ad at the top and one at the bottom of the page

- Having one 300x250 text ad at the middle of the page somewhere among texts

- Well optimized pages with a good title, description, h1 headline and ... .

- Good and fresh content.

Can you add more tips?