If you have a Surface Type Cover for your Surface Pro, you can use the PrtScn key to copy a screenshot to your clipboard.
One way to lock a Windows computer from your keyboard is by pressing Ctrl + Alt + Del and then selecting the "Lock" option.
If you have Amazon Prime, you also get access to discounted Amazon Kids Plus. The subscription service features a range of ad-free content, including books, games and videos for children ages 3 to 12.