Learning English is very important as English is the official language of 53 countries. That is a lot of people to meet and speak to. English is spoken as a first language by around 400 million people around the world.
When you learn English you have access to millions of books and other information which are only available in English. This is the era of information, hence it is always necessary to learn English as second language to know the world and to have access to these information.