You can update via OTA updates by opening the Settings app, going into General settings and accessing Software Updates. (news.softpedia.com)
So the best way is to wait for OTA updates in your region, and install them in 2 - 3 minutes when available. (nashvillechatterclass.com)
According to Google, getting yourself into the Android Beta Program will earn you a ticket for receiving OTA notifications immediately a new beta is released. (nashvillechatterclass.com)