There arte many top key words for Adsense Revenue or any websites, they are:
HOW TO DRIVE
HOW TO COOK
HOW TO LOAN
It depends on your title and theme of your writing. If it is about HOW TO BE FIT AND YOUNG, your keywords should be:
Use keywords about fitness such as FITNESS FIRST,ANTI AGING PRODUCTS,SUNSCREEN,ABS EXERCISE, WEIGHT LOSE, SEXY BODY ETC...