Why is learning English important?

I'm writing about why I'm learning English. The reasons are as follows:
1) English is the most common language in the world. One of every five persons can speak English or at least they can understand. There are more than 400 million people speaking as native speakers.  English is spoken either officially or as a main language in more than 50 countries. Although there are a lot of people speaking Chinese, Spanish, French and even Russian and German as native speakers, and the importance of these languages has increased a great deal in the past decades, English is still the largest common denominator that allows people to meet and work together worldwide.
2)Knowing English provides a golden opportunity for your career. If you want to work in a multinational company, you have to know English well. It makes you more attractive to employers.
3) Knowing English paves the way for access for the best universities in the world. Where do you want to study? Have you ever thought about applying to Harvard, Yale, Princeton, Stanford University or a reputable British university such as Cambridge or Oxford? Even if you don't want to attend these big universities,  because English is spoken in a lot of different countries, there are thousands of schools worldwide that present English programmes. If you can speak and understand English, there are lots of opportunities for you.
4) English can open doors that will give you access to information and it certainly broadens your horizons. No need to think too much on this. Most of the available content is in English on the Internet.    (editor comment: excellent work!)