It's a good idea to rent a house or a flat and move in with friends after the age of 18.You learn to look after yourself and find your feet.
I agree with you, but don't forget ...
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If you live with friends, you are together with your peers, who may understand your problems better than your parents.Also, you can learn from your friends experiences.
So what it comes down to is...
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You are free to do more. For example, you can stay out late or have a party without having to ask for your parents' permission.