I have got my Adsense account since 2010 & this account still live till now. So in dis post, I just want to write down some of my experience in working with Adsense system . Hope this helpful 2 u.
1. Keep ur adsense in safe
Do not show ur adsense information in forums ,websites because u r violating Adsense TOS . If u want 2 show a proof of ur earning , make sure u hide d name & necessary information be4 . A proof of earning can b reason 4 an attack 2 ur site 4m people who is green with envy.2. Do not cheat
Cheating Adsense by changing ip & click the ad urself will make ur account banned soon. Google keep track on ur IP address when login /log out & IP of person who click the ads. If these IPs are the same ,u may got an warning email .All the text / banner that encourage people click the ad is also a violation to TOS . I don't know they use auto bot to check the text/banner or have a team for this work ,but we hardly out of their sight .
3. Disable ad-serving from copyrighted material
Always check for copyrighted material if u don't want to disable all ads in site : Pictures from pro-photographers , music /game ... The author can report to Google or Google check themself .The best way to escape from this situation is very simple : remove all things that may copyrighted material & submit ur site to Google support . They will review ur site in next 3 working days & give u the answer . If ur site meet their requirements ,they will restore ad-serving in ur site.4. Protect ur Adsense Id
Sometimes,ur adsense code can be appear in unwanted websites . Some people make a clone of ur site with everything inside ,copy ur post & ad code . Some people want to attack ur adsense , they add ur adsense code in their site with adult content ,copyrighted material ... U will get a ban easily without knowing the reason .To make sure Adsense is only appear in ur site , login to ur Adsense dashboard - > go to Adsense Setup - > Site Authentication . U will find option for showing adsense ad in specific sites .
5. Invalid clicks
Google Adsense is one of the biggest incomes of Google , & Google invest billions dollars in Adsense system to make it become a giant in internet advertising industry . So their system is more & more intelligent .Nowaday , Invalid clicks are still tracked but don't generate earning . Google can realize what invalid click & cheat clicks . Of course , this is still an automatic system & mistake is still exist .So take care of ur account .
6. Bomb click attack
If u have Google Adsense account for a long time ,u probably see a bomb click attack . The attackers click on the ads in ur site many times . They try to make Google believes that account owner are cheating . And Google will give u a ban :D Sometimes , Google can realize this but sometimes they don't . I got a bomb click attack before . Google tracked the clicks but all these clicks don't generate any income & I didn't get any warning or ban from Google .In my experience , to avoid troubles with a bomb click attack ,u should always keep an eye on ur account . If there are any abnormal activity in ur account ( the number of click increase extremely) , u should remove all Adsense code from ur site , tracking the IP of attacker & then ban this IP range from accessing ur site .