How can I lose weight?

I am overweight

145lbs, 5ft

I'm going to have my 18th birthday party on September and I wish to lose weight for the event. I don't want to spend money so going to the gym is not an option.

What diet do you recommend? How often...or how little should I eat? And What are the kinds of exercises can I do here at home?

thank you.
How can I lose weight?
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