Fit page in window = Ctrl + 0

Preview/Display rendering quality:

• Ctrl + Alt + Z = normal
• Ctrl + Alt + H = high

Switch to preview mode:

• W : if not in text mode (to turn on and off)
  or first
• Ctrl + Shift + A = deselect all →  then W

Change image size:

Black arrow (select tool) + Ctrl + Shift → changes framesize and imagesize 

Text Frame Options = Ctrl + B

Delete text overflow:

Click after last text sign which should remain and press Ctrl + Shift + End > this marks the rest of the text (till end) > Delete

Count Words:

Select the text, then either go to Windows > Information or just use F8.