Hello Surojit,

Computer science trade is very widely distributed according to your qualification however there is nothing like qualification in computers because computer is not only a course but also a skill. If you know the computer practically then you can easily possess any certificate, diploma, or degree.

You can start computer by preparing for basics like certification in basic computer then learn the programming languages like C++ and various others. Further you can develop the skill based on your interest and discover with exploration in computer science.

I hope my answer have helped you and hope you do well in future.