Answers:
I was taught five. Or just hit the tab button once.
Yup. Just press the tab button on your computer. That space is an indent.
I learned that you indented 5 spaces. That wasn't all that long ago either. But I don't think that 7 would be a problem as long as you were consistent.
I was never taught to do a certain amount of spaces, I usually do 4 because I think that looks right. Do however many you want.
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