How to prevent stripped screws?

I remember about a year ago I attempted to replace my charger in my iphone 4. It was successful but I messed something up withy audio. So I tried to go back, but my screws were stripped, I couldn't unscrew it at all. This week is trying to replace something inside of a 3ds (The analog stick) what steps can I take to ensure I don't get stuck with stripped screws?

To get the stripped screws out, take a rubber band and place over the screw. Use your screwdriver and press hard to unsrew. Sometimes this method will work and sometimes it won't.
To prevent a screw from stripping, make sure you are using the correct size screwdriver. If you see the screw is starting to strip, stop unscrewing right away. Don't force it

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