There are many answers to this question. The most important one would be that English has become the most commonly used language on the globe.
English is the main language for more than 50 countries.
It is the most used language on the internet.
Most operating systems and software use English as their dominating language.
English is the new language of Economy, Education and IT.
Conferences and seminars are held in English.
International Schools across the world use English as their teaching language.
Over 350 million people speak English as their native language and a billion people can speak English as a second language in the whole wide world.
English opens doors. It is the skill you want to have on your resume. It helps you evolve in your career.
There is information you can only learn in English.
You need it to use your gadgets at home.
English simply improves the quality of your life.