(6) Use relevant images means use images for your articles (content) and relevant means matching. It means you have to use (put) images in your content, but they should represent what you are writing. For example see the pictures within our website. In Wealthy Affiliate, we have put pictures of Wealthy Affiliate, In Paidverts, we have use picture of Paidverts and so on.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.