4 Quick overlooked Windows hacks

1. Open up Task Manager right away (SHIFT/ALT/ ESC): most people are used to access Task Manager with CTRL/ALT/DEL but this implies one more step, while the alternative combination opens it up directly. 
2. Select all files in a folder with a click (CTRL/A):  This can come in handy if you need to remove or rename numerous files.
3. Undo a copy operation (CTRL/Z):  If you realize you have copied the wrong file, you can undo the operation with this key shortcut.
4. Access all Windows settings with one click  (God Mode):  a not very known Windows trick allows to keep all settings in one folder, where they can be easily accessed. For more details about it: Windows God Mode: access 720 Windows settings with a click