One of the most important things to any blogger is, "How many people are reading what I put here?" Blogger makes that incredibly easy to find out. You don't need to install any kind of tracking code or plugin. Just head to the "Stats" tab and you'll see how many page views you had today, yesterday, in the last month, and since the blog was created. You can also check on traffic per post, and where your traffic comes from.
It's possible to break down the stats even further. If you want to know what country most of your readers are from, or even what browser or operating system they use, all the info is available in the "Stats" tab.