I am an engineering graduate but I want to make my career in stock trading. I have no idea where to start from. Should I do some course

Yes,  you have to learn the basics of stock trading form any institute, you can do some basics courses in the stock market like

Trading basics

Introduction to financial market

Investing managements

Trading strategies in emerging market

Basics course of technical analysis

Advance courses of technical analysis

However, if you want to learn the basics of fundamental or technical analysis you can join any of the institutes like the National stock exchange for short-term course you can visit their website for more information. There are various institute where you can learn the courses radical Institute of stock market,Sharemarketshiksha Maheswari institute, Arihant capital market, Kalpataru Institute of capital market, etc.

(Source: https://www.quora.com/I-am-an-engineering-graduate-but-I-want-to-make-my-career-in-stock-trading-I-have-no-idea-where-to-start-from-Should-I-do-some-course)