Assuming you might have done your bsc in pcm(phy,chem,maths),for a career in IT there can be multiple pathways first choose in which domain you would like to work . IT is very vast ,some good domains are networking , development, etc.

Networking  generally deals with connectivity infrastructure. If you choose to pursue this ,ccna rs will be a good certification to get basic knowledge and a entry level jobs in networking

Development is more vast ,there are software developers ,web developers ,etc .if you would like to pursue this .try learning basic programming language start with c/c++ and then ,learn all about data structures and algorithms.