Hello,Prashant 

The courses which you can prefer to make your career in IT sector solely depends on your interest in which ever field you choose.The following are names of some of the in demand courses:

Mobile App Development

Web Development

Cloud computing

Programming Language(Java/Python/.Net/C/C++ and many more)

Machine Learning

Artificial Intelligence

Database Administrator

Networking(Cisco certifications)

BSC-IT 

Data Science.... and the list is endless!!!

But before getting into all these cool stuff you got to make your basics strong.Learn a programming language of your interest,get a good understanding of Data Structure and Algorithms and practice..practice..and practice as many programs as you can to get a good grasp of the topic.There are ample of good sites such as Udemy,Codecademy,Udacity etc that provide really amazing stuff of which ever course you want.Even there are may youtube channels that helps us understand the concerned topic in a simple and easy way.Getting certified in your chosen field is good as it indicates that you have in deep knowledge of that course.

So all the best for your future and remember...

However as you are from commerce backgroung without any IT basics back ground ,initially you may find it difficult to ope up but you can do best in the above mentioned courses.