Being a first year cse student, What are the certification course (online and offline) should I learn for better placement?

First of all, u need not worry about placement right from first year. U can go for certification courses from second year onwards.

Firstly u need to identify your interest. If u want to go for web development, then it would be preferable for u to go for C++, Java courses. And if u want to go for web designing then u can go for PHP, .net, etc.

Hope this proves to be useful.

Thank u:)