I am a college student and I earn approximately 8000 rs per month . First of all I must say that there is no website or app available that pay you without doing any work .
These are the following things which I do in my free time to earn some extra pocket money
Chegg - This is the website where many questions are available and per question it gives 100 - 200 rs . You can check it out on google . If you do 1 question daily , then u will able to earn atleast 4000 to 5000 per month.
You gov - It is the survey website . For each survey , it gives 50 to 200 points and when points reached to 5000 then you can reedem the payment to paytm wallet .5000 points = 3500 rs .
Freelencing websites - it is the website which pays you for your skill . U work for some projects and then you will gwt some money according to that . Check fiverr on google and check what skills you have and according to that choose some work and done it in a fixed interval of time and you will get paid.
There are many more things to earn money online but if you are the begineer then follow these above steps .