Open Question: I am a resident of India.I work as a Freelancer.I need to pay my tax.?

I am a resident of India.I work as a Freelancer.I need to pay my income tax.But first I need to know how many tax do I need to pay..so is there any internet website/platform that can help me to calculate the tax I need to pay.I know I can go a to CPA....but I need to have some knowledge on my own before I go to the CA. Thanks