Nowadays, English is one of the most commonly language among foreign language speakers. Furthemore, we study it in Spanish schools. However, there are many people that don't like English and who think that this language should be optional. There are several points to consider.
On the one hand, learning English is quite important as it's the second most spoken language in the world, after Chinese language. Moreover, when people of different countries come together they usually use English to communicate, or when you go on holiday to another country you can use it to exchange information. In addition, it's easier to get a job if you can speak this language, so we can say that English opens doors. It is said that English is a different language to learn, but we are used to listening American songs which are English and there are also lots of apps to learn it, where we can also make friends with people from other countries.
On the other hand, some people think it isn't necessary to learn English since it takes a lot of time and effort and as I've said before, it's such a difficult language. Another reason is that Spanish is spoken by millions of people so, why shoulf we learn English if lots of people speak Spanish? That's probably what most people think. Furthemore, when you go on holiday to another part of the world, you don't need to use the local language.
All in all, there are advantages and disavantages of learning English, but I reckon it's so important for everyone to have tje opportunity of learning a foreign language, either English or German, French, etc, since we are going to need languages more and more.