Hello there!

Greetings!

Yes, of course you can do online work and make money while pursuing your btech , there are large number of jobs on online platforms and you can work as a freelancer at the convenience of your home , all you need is to have some skills , be it content writing, web development or data entry etc you can get all kind of jobs on online platforms like internshala, fiverr, upwork, freelancer etc . You should  visit these sites .

thankyou