AdWords advertisers, as well as Google Grants advertisers, have to be particularly focused on solid ad text as they're the main ingredient to make their campaign work. These ads must also comply with AdWords policies.
"First, if you want to modify an ad, its recommend creating a new one and leaving the old one running until the new one is approved. This ensure you've an ad running at all times because every time you submit new ads or make changes to existing ads, they're automatically submitted to a review. Secondly, take a note of specific ad guidelines policies to be sure that your ads comply and will be published," explains Google.
See below for some of our most important policies when creating an ad: