you will only get what you put in

With any new (or even new-ish) system that comes in to play, there will always be bold claims made about how rich it will make you, and for how little work you can become successful. Some people are naïve enough to believe that this latest program will end their money worries at a stroke, but the fact is that it’s not likely to happen.
Imagine for a moment that someone designed a machine that printed viable money, in whatever currency and denomination you wanted, and you could spend that money in any shop. Would the machine retail for a low price? Of course it wouldn’t, because it has the potential to give you money without you working for it. Why, then, would you believe that any plug-and-play system would make you immediately wealthy without you needing to work with it?
Adsense can make you real money, there is no doubt about that. However, you have to work with it. Just as having an exercise bike in your garage will not develop your calf muscles if you don’t actually use it, Adsense won’t make you any money if you don’t harness it and put your own effort into the mix.
If you have a website and you host Adsense ads, then maintain your content, add to it at least occasionally and check your Adsense results regularly so you can see what is working and what isn’t. Lose the stuff that isn’t making you money and do more of the things that are. Work with Adsense – the more you do that the more you will learn.