I can only give you some points:
1) can improve your speaking and communication skills
2) can find a good job more easily
3) can communicate with people from foreign countries
I try my best:
Learning Englsih is very important for two reasons. First of all, I can find a good job with a high salary. Most of the office need a good Englsih level. Second, English is a international language. You can communicate to whoever speaks English only.