Keyboard shortcuts.

1. Delete an item in a permanent way without placing it in the recycle bin.
Shift+ delete
2. Rename a file or item. 
Shift while dragging an item.
3. Highlight a block of text.
Shift+ any of the arrows
4. Select all:
CTRL+A/CTRL+E
5. Close any open window or app
Alt+f4
6. Refresh 
F5
7. Swich between apps ?
Alt+tab
8. What is the English name of the key "Retroceso"?
Backspace
9.  What is the English name of the key "Suprimir"?
Delete
10. Closes only one tab from a multitab app?
CTRL+F4.