learn the rule: lose / loose

• lose is a verb, indicating to be deprived of or cease to have something
• Did you lose your sock?
• I don't know where or when I lost my potato.
• I am very sad at the loss of my intelligence.
• loose is an adjective, meaning something which is not firmly attached or fixed in place (or slang, for a slapper with a big fanny)
• You have a loose grip on the English language.
• You're loose and smell of fish.
• The two are not interchangeable.
• Getting it wrong makes you look stupid. And ugly. And smell of fish.