ScreenShot: windows button + volume down button
Task Manager: windows button + power button
How to lock screen rotation
Swipe from right side.
Go to Settings - Screen and tap the icon above the brightness slider. You¡¯ll see a little padlock icon. Tap it once to lock or unlock it.
How to use the virtual keyboard
If you find that you need the virtual keyboard and it isn¡¯t there, then swipe in from the right and tap Settings - Keyboard - Touch keyboard and handwriting panel. You can move the keyboard around by tapping and holding on the top edge and then dragging it where you want. Tap the keyboard button at the bottom right to switch between layouts. You can choose from traditional, split, handwriting, and full size.