MSPAINT related

How to Increase DPI in Paint

How do I make the eraser larger on WINDOWS 7 MS paint?
press (ctrl key) + (+ key from numpad); size will increase

How to select area off screen
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Doesn't seem possible.
Resize image first before select.

Source:
MSPaint-area select scroll off screen?

Make selection transparent (Windows 8)
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Under the Image section of the ribbon, click the "Select" drop-down menu. The bottom command is called "Transparent Selection" and it can be toggled on or off.
Just like the older version of of paint, the Color #2 is the transparent color (so you could remove a white or black background, just make Color #2 white or black, respectively)
FYI, the other command I had a hard time finding was to make the canvas bigger/smaller (but not shrink/stretch the image). It used to be called "Image attributes" but now you go File>Properties, and you can adjust the size there.