practical weight loss tips

Kelli
I'm 19 years old, work full time as a pizza delivery driver, broke college student, and my right knee isn't fully developed while my left knee has little to no cartilage left! 
Are there any practical weight loss tips I can do? Dieting, excersizing, anything!? 
Should I consult a doctor before doing anything because of my knees?
I have NO MONEY to buy excersize equipment, so I need things I can do at home
Thank you in advance! 

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