Dear Saima

As this is your first attempt at writing, I don't want to discourage you.

However, before you hit publish you should proof read.

"Each revolution obsolete some specific human jobs. Such as the invention of machines replaced manual workers’ jobs, automobiles replaced carriages, and personal telephones and mobiles obsoleted the local telephone operator and postman jobs."

This is not a coherent paragraph. Lots of grammatical errors. Check twice, publish once.