So if you have a site that talks about interior design and which mentions
"homemade furnishings" a great deal, Google will assume that your readers
will be interested in the sample ad above. But that won't be the only ad that
could appear on your page. There could be dozens of others. Google will give
you the ads that it thinks will give you the highest revenues.
That might not be the ad with the highest possible click price though. If a
lower paying ad gives you more clicks and higher overall revenues, you
should find yourself receiving that ad instead.
In theory then, you could just leave it to Google to decide which ads to give
you and at which price.
In my experience though, that just cuts you out of a giant opportunity. You
can influence the choice of ads that you get on your page, both in terms of
content and in terms of price. You can certainly influence the number of
clicks you receive on those ads. Google leaves that entirely up to you - and
it's a crucial part of the difference between earnings that pay for candy bars
and earnings that pay for cars.
In short then, while signing up for AdSense can be both the beginning and
the end of turning your site into income, if you're serious about making
serious money with your site, it needs to be the beginning. You'll want to
make sure you're not getting low-paying ads, and you'll want to make sure
that you're getting the clicks that turn those ads into cash.
whichmentions"homemadefurnishings"agreatdeal,Google will assume that your readers will be interested in the sample ad above.But that won't be the only ad that could appear on your page.There could be dozens of others. Google will give you the ads that it thinks will give you the highest revenues.

The next piece of information that Google demands is your URL. There's only
room for one URL, which can be confusing if you have more than one site
and want to put AdSense on all of them. Don't worry about it. It won't affect
how you use AdSense at all, so just submit your biggest site for now.
The next question is about whether you want content-based ads - the type
of small text ads I've been discussing so far, search ads or both. (Content-
based ads are better but I'll tell you how to benefit from each so I
recommend that you choose both.)
Once you're approved, you'll just have to copy and paste a small piece of
code into your website and you're done!
room for one URL, which can be confusing if you have more than one site and want to put AdSense on all of them. Don't worry about it.
It won't affect how you use AdSense at all,so just submit your biggest site for now.