It was in March 2009 that I started using AdSense, and since then it’s a part of my blog monetization technique. In first 5 years I have earned about $20k with AdSense, AdSense is one of the best contextual and highest paying ad network for any blogger.

Stop, Read carefully and Understand Adsense TOS and Stop violating Adsense Policies:

Most of publisher who starts with Adsense, they usually ask their friend to click on Ads or click on their Ads from different I.P. Also their friends wants to give them some pnline income, so they can click. If Adsense team detect such activity, they put your account in disable mode to ensure and safeguard their Advertisers.
Also, many new publishers ask their readers to click on ads, which is also discouraged by Adsense as stated in their program policies.

At the time of writing, Google doesn’t support all the languages to qualify for Adsense program. If you have approved AdSense account, and you are using it to show it on the blog whose language don’t qualify Adsense TOS, then make changes asap. Especially, if you are using any method to make your blog multi-lingual and serving Ads on it, this will be considered as a violation.
Here is the list of AdSense supported language.

AdSense work on simple rule of 1-2-3 to define the maximum number of ad unit on a single page. Though, this is not any violation of Adsense policies as this could be a mistake, and AdSense won’t show more than three content ad unit unless you are a premium Adsense publisher.

Many publishers started the trend of sending AdSense adverts within the email, and sometimes it goes viral. Google find it against the program policies.

Many publishers started using a trick like click here, Click to see hot babe, and this also helped to encourage the click. Encourage click? Oh, time to look at point 4. Or you use pop-up script to show Adsense in pop-up and readers have to click on it to read the content, Ahh big no!

Make sure you don’t use any other contextual advertisement program. Let Google ad sense by your only and favorite advertisement program. Though for monetization you can use many other ad networks and here are some which I have used, and they comply with Adsense TOS. Infolinks, BuySellads, Technorati Media, Viglink.

So you are a programmer? Huh! Doesn’t matter. Changing your Adsense code in any ways is not permitted by Google.
Shading with Image: Placing Google Adsense Image ad unit with the adjacent image can be a great and smart move, but guess what? Do it and Google AdSense might ban you. Google TOS doesn’t allow the use of shading your AdSense image ads with the adjacent image.

• Read few more from official Google page

If you are running Adsense on a site that distribute copyright content like Movies, songs or any other files, you are most likely to get an instant ban. Adsense doesn’t allow putting Adsense on the site that distribute copyright stuff. So keep away from copyrighting.

This is something which I got to know about in 2012 and one of the reasons why most of the sites are getting Adsense ban. If you are linking to sites like (Streaming movie), illegal or pirated software, Keygen sites, your AdSense serving might be disabled for that particular site. Here is the other type of content, which is not allowed for Adsense sites:

• Porn, Adult material
• Violent content
• Racial content
• Hacking/Cracking
• Gambling/Casino
• Pages selling Drugs, Alcohol (Beer or hard alcohol)
• Pages selling Weapons and ammunition
• Distribution of course work. Eg: Student Essays

Above are just an example, and there could be more. So, you should avoid putting any such content on your blog or at least avoid serving Adsense on those pages.

If you are buying traffic for your Adsense enabled sites, it’s not permitted according to AdSense TOS. Also, consider reading Adsense landing page Quality guidelines, which will give you ample amount of idea, what Google expect from your pages.
Promoting your post on Social media or buying traffic from quality sites like Facebook, StumbleUpon, Reddit is not the violation.

Making ads look like part of content:
You are free to make your ads blend with the content by changing the color or size, but don’t make it look exactly like content. In below image you can see what kind of mimicking is not acceptable:

Quick things to know:

• Don’t make your AdSense ads sticky. Making it sticky is against AdSense implementation policy.
• Using AdSense ads on a Site, which curate videos from Youtube or other video hosting site, can put your account in radar. To Avoid this, ensure you also have original content on your blog. A good idea is to add 200-300 words content in your words describing the video.
• Don’t place AdSense ads on 404 error page, Exit pages, log-in pages and thank you pages.

But if you are a victim of AdSense ban game, OnlineLivingBlog earlier post on AdSense alternative program will be very useful for you. 

Finally, using the service is free. I actually got my start some five years ago on a Blogger.com blog as I mention first. I ended up making over $1000 a month on AdSense ads on that particular blog! 

Happy Earning
Regards
Founder of this Blog!