Followings are common and important Guidelines and Policies of Google AdSense which are commonly violated by new users/publishers of Google AdSense. So, it is advisable to stick with these rules and regulations and keep your Google AdSense safe and remain in approved state.

• Never click on your Google AdSense ads.
• Do not invite or force anybody to click on your ads being displayed on blogs or website you own which will lead to Click Bombing.
• Choose the location of ads in your website aptly to avoid accidental clicks by the visitor.
• Do not use prohibited content in your article or website.
• Always use content which is relevant and genuine.
• Do not try to alter ad code generated by Google AdSense.
• Never use paid to click system.
• Remove Gambling or Adult Content.
• Report strange activities immediately.
• Never use pop-up prompts.

Invalid clicks and impressions

Publishers may not click their own ads or use any means to inflate impressions and/or clicks artificially, including manual methods.

Encouraging clicks or views (non-rewarded inventory)

Except for rewarded inventory, publishers may not ask others to click or view their ads or use deceptive implementation methods to obtain clicks or views. This includes, but is not limited to, offering compensation to users for viewing ads or performing searches, promising to raise money for third parties for such behavior or placing images next to individual ads.

Content policies

Publishers may not place AdSense code on pages with content that violates any of our content policies. Some examples include content that is adult, shocking, or advocates racial intolerance. Please see our prohibited content article for more information.

Abusive experiences

Publishers may not place Google ads on sites that contain abusive experiences. See the abusive experiencespage for more information.

Authorized inventory (ads.txt)

If AdSense publishers choose to use ads.txt on their domains, those publishers must ensure that they are included as authorized sellers of that inventory. For more information, see Declare who is authorized to sell your inventory with ads.txt.

Copyrighted material

AdSense publishers may not display Google ads on pages with content protected by copyright law unless they have the necessary legal rights to display that content. This includes pages that display copyrighted material, pages hosting copyrighted files, or pages that provide links driving traffic to pages that contain copyrighted material.

It is our policy to respond to notices of alleged infringement that comply with the Digital Millennium Copyright Act (DMCA). For AdSense publishers, if we receive a notice or otherwise have reason to believe that your page is infringing, we may terminate your participation in the program. You can file a counter-notification via this form. More information about our DMCA process is available in this blog post.

If you believe that a page which is participating in the AdSense program is displaying your copyrighted material without the rights to do so, please report it using this form or by clicking on the AdChoices icon .

Counterfeit goods

AdSense publishers may not display Google ads on webpages that offer for sale or promote the sale of counterfeit goods. Counterfeit goods contain a trademark or logo that is identical to or substantially indistinguishable from the trademark of another. They mimic the brand features of the product in an attempt to pass themselves off as a genuine product of the brand owner.

Traffic sources

Google ads may not be placed on pages receiving traffic from certain sources. For example, publishers may not participate in paid-to-click programs, send unwanted emails or display ads as the result of the action of any software application. Also, publishers using online advertising must ensure that their pages comply with Google’s Landing Page Quality Guidelines.

Ad behavior

Publishers are permitted to make modifications to the AdSense ad code so long as those modifications do not artificially inflate ad performance or harm advertisers. Please see Modification of the AdSense ad code for more information.

Ad placement

Publishers are encouraged to experiment with a variety of placements and ad formats. However, AdSense code may not be placed in inappropriate places such as pop-ups, emails or software. Publishers must also adhere to the policies for each product used. Please see our ad placement policies article for more information.

Site behavior

Sites showing Google ads should be easy for users to navigate. Sites may not change user preferences, redirect users to unwanted websites, initiate downloads, include malware or contain pop-ups or pop-unders that interfere with site navigation.

Technical requirements

To help you provide a quality user experience, Google has developed technical specifications for sites displaying Google ads. We only allow sites that comply with these technical specifications. Please review below for detailed technical requirements:

• Use supported languages
  • Google publisher products do not support all languages. Applications for participation in these programs can be for sites with content primarily in the following languages.
• Format requirements
  • WebView
    • AdSense for content (AFC) and Ad Exchange (AdX) display ads are not supported through all WebView technologies. App developers wishing to monetize by publishing AFC and AdX display ads through a WebView must use one of the following supported viewing frames:
      • Android: Chrome Custom Tab
      • iOS: SFSafariViewController (iOS9 and iOS10 only)
    • Google AdMob and AdX in-app ads may be shown in an app next to a WebView so long as the Google Mobile Ads SDK is in use and the publisher is compliant with all other AdSense program policies.

Google advertising cookies

AdSense publishers must have and abide by a privacy policy that discloses that third parties may be placing and reading cookies on your users’ browsers, or using web beacons to collect information as a result of ad serving on your website. Learn more about preparing your privacy policy.

Identifying users and user consent

You must not pass any information to Google:

• that Google could use or recognize as personally identifiable information; or
• that permanently identifies a particular device (such as a mobile phone’s unique device identifier if such an identifier cannot be reset).

You must not use Google AdSense to facilitate the merging of personally identifiable information with information previously collected as non-personally identifiable information without robust notice of, and the user’s prior affirmative (i.e., opt-in) consent to, that merger.

For more information, please refer to Guidance for complying with the Identifying Users Policy.

You must also comply with the EU user consent policy.

Privacy

You must disclose clearly any data collection, sharing and usage that takes place on any site, app or other property as a consequence of your use of any Google advertising service. To comply with this disclosure obligation with respect to Google’s use of data, you have the option to display a prominent link to How Google uses data when you use our partners’ sites or apps.

Children’s Online Privacy Protection Act (COPPA)

If you implement any Google advertising service on a site or section of a site that is covered by the Children’s Online Privacy Protection Act (COPPA), (a) you must notify Google of those sites or sections of sites covered by COPPA using the tools found here: https://search.google.com/search-console/coppa, or the method for apps described here: https://firebase.google.com/docs/admob/android/targeting, and (b) you must not use interest-based advertising (including remarketing) to target: (i) past or current activity by users known by you to be under the age of 13 years or (ii) past or current activity on sites directed at users under the age of 13 years.

SOURCE: https://support.google.com/adsense/answer/48182

Webmaster quality guidelines

In order to ensure a good experience for users and advertisers, publishers participating in the AdSense program are required to adhere to the webmaster quality guidelines. These guidelines provide many tips for creating sites that help Google find, index, and rank your site. In general, following these tips will help you to provide a positive experience for your users. The guidelines are quite extensive so we’ve highlighted some important information below:

• Make sure your site adds value. Publishers are not allowed to create multiple pages, sub-domains, or domains with substantially duplicate content.
• Publishers must provide unique and relevant content that gives users a reason to visit their site first.
• Avoid “doorway” pages created just for search engines, or other “cookie cutter” approaches such as affiliate programs with little or no original content.

Please keep in mind that participation in AdSense doesn’t affect a site’s rank in Google search results and won’t queue its webpages for crawling by our main index bots. Publishers wishing to improve their ranking in the search results should visit our Webmaster Central and Search Console, which are available to all publishers.

Sites that don’t meet these guidelines may be removed from the search index and have AdSense ads disabled. If this has happened to one of your sites, you can modify your site so that it does comply with the guidelines and then submit your site for reconsideration.To learn more about protecting your site content, read our Inside AdSenseblog post.