The [/Debug/Start without debugging] command is a quick way to program your device, instead of going through the numerous keystrokes and mouseclicks needed to get your device programmed through the [/Tools/Device programming] interface.
You may have to select your programmer as the tool to use before you get this to work the first time. The simulator won't work for programming a device.
By holding down the [Alt] key while making a selection in the editor, the selection will have a rectangular outline. Rectangular selections can be copied, cut and pasted just like any other selection.
This is very handy in certain editing operations, but may require a little practice to get used to.
Pasting code - avoiding reformatting
When you paste a block of code the editor sometimes applies some reformatting to it. If you want to keep the original format, hit [Ctrl]+[Z] after pasting to undo the reformatting.
(This "feature" is rather annoying - why does the editor do that in the first place ?)