Using Google Analytics
Once you have installed Google Analytics on your websites, you'll need to wait a few weeks, or perhaps longer, for Analytics to collect enough data from your websites to be useful. Remember that with website analytics, like any type of statistical analysis, larger sets of data reveal more accurate and useful information. It may not take that long if you have a high-traffic site, but if you have a fairly new site that doesn't get a lot of traffic, it will take some time, so come back in a few weeks to a month to check to see how your sites are doing.
The Audience Overview report is your default report that is displayed to you when you first log into analytics and gives you a quick overview of each site's traffic.
You can see at a glance, whether the tracking code is receiving data, how many visits (sessions) your website has gotten in the past 30 days, the average time visitors stay on your site (session duration), your bounce rate (the percentage of users...