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If you chose a Microsoft account, these options on the Sync your settings tab are enabled by default. (If you use a local account, you can't sync settings - sorry.)
In all, there are 12 separate options shown here, and all are enabled. You might want to disable some of these options. For example, you might want the background on your desktop PC to be different from the background on your notebook, so that you can tell at a glance which is which if you're using a remote connection. In that case, move the Desktop personalization slider to the left (Off) position.
From PC Settings, click Users to manage your account. When you do, you'll see three options under the Sign-in options heading.
If your desktop computer is in a secure location where you're not worried about intruders, consider adding a PIN as an alternative sign-in option. The PIN is a four-digit number, and it exists as an option alongside your (strong) password.
The PIN is used only for unlocking your PC locally. For remote access to shared resources, you still need to provide a password.
If you've used Windows for any length of time, you've probably gotten used to the frustration of finding programs that automatically add themselves to your Startup folder, slowing down the boot process and sucking system resources.
The new Windows 8 Task Manager has a Startup tab that consolidates most auto-start programs into a single, easy-to-find place. You can disable any item by selecting it from the list and clicking the Disable button at the bottom of the dialog box.
Not sure what a startup item is? Right-click its entry in this list and use one of the options on the shortcut menu to find it in Windows Explorer or look it up using your default search engine.