Windows 8 comes with a bunch of pre-installed "modern UI" apps, so you might as well familiarize yourself with the most high-profile entries. We have detailed primers on Music, Photos, Mail, Calendar, SkyDrive and People. None of these apps is perfect, though the SkyDrive cloud service is an integral part of the new Microsoft ecosystem, so you really should check out its implementation in Windows 8.
Precisely because Microsoft's built-in apps are so lacking, you'll want to hit up the Windows Store for Windows 8 apps to populate your new Start Screen. On the day Windows 8 launched, we published our top 10 list of the Windows 8 apps to download first, but just this week we updated the concept with a new article geared specifically to Windows 8 tablets.
New Windows 8 hardware owners should also read our suggestions of the best streaming media apps for cord cutters, the best Windows 8 casual games (our author tested a vast selection, and then chose the 15 most worthy), and best productivity apps.