Goal and options: To hang a magnet on a wall, you can
output answer: Attach the magnet to something metal in the wall, like a bolt

Goal and options: How can I clean my guitar strings?
output answer: To clean guitar strings, start by resting your guitar on its back so you have both hands free to work. If your guitar has nylon strings, use a dry or slightly damp towel to wipe off any dirt or grime. For guitars with steel strings, put 70 to 90% rubbing alcohol, pre-shaving gel, or a commercial cleaner on your towel.

Goal and options: how do you put deodorant on?
output answer:
rub the stick along the inside of your armpit.