There are numbers of reasons to learn another language. English, specifically, has its own advantages. International business, aviation and media use English almost exclusively. Educational opportunities in the US, England and Canada are extensive. English is expository. It will make you a better debater, a better writer and helps you express yourself.
The disadvantages depend on the nationality of the person learning English. Chinese students see learning English as an insult to their Chinese ancestry. Arabs see the language as the sounds of an enemy. Tonal languages can't quite grasp the direct nature of the language. Some backgrounds do not see the need for individual thought or individual expression. It is a difficult language to learn with nearly every rule having an exception. Idiom and slang is such an integral part of everyday life so that figurative speech is incomprehensible to the non-native speaker.
There are over 25,000 idioms in English from hanging up a phone to having your eye on someone. In Italy a road doesn't "go" anywhere. In France you don't live "on" a street. In Germany there is no difference between "I do work" and "I am working".
English is a Germanic language with borrowed words from every country past and present. English is an advanced, developed language; no formal or informal, no tenses, except for who and whom, and only one way to say "The". In German there are six ways to say "The".
The most important benefit is getting a better understanding of your first language. You can transfer the skills learned in English and apply them to your first language. I speak French, German and English. I teach English as a second language at a university in the US. Learning another language is seeing the world through a different lens. You see the world from another viewpoint. You become a member of the world community, not only the community you happened to be born into.
English is so widely spoken that many native speakers of English do not see the point of learning a foreign language ... That is very isolating.
Yes because English is the language of business in the world. It also gives Filipinos an advantage when it comes to expanding in a global market. The English language also acts as a neutral national language where regional biases cannot be implied.
The advantages are largely the same as learning any other language... the ability to communicate in that language. English might carry a special advantage for people who work or live in an English-speaking country, or who do business in English. The side benefits of being able to understand jokes and read great English literature are there, of course... but those exist in any language, and (depending on how well the language is mastered) sometimes are never fully realized.
What's more important than learning English is understanding why you need a language (not necessarily English).
English is the international language. Knowing how to speak and write in English is an advantage so as to be able to effectively communicate anywhere in the world.
English is the first or second (or third) language of people all over the world. It is also the principal language of the Internet and of many print publications in spite of the fact that there are huge populations of Chinese and Indian people.
For various reasons, English has become the first or second language used by most of the people on the planet Earth. Thus if you can speak English you can have a conversation with anybody anywhere - that has never happened on Earth before. Thus a non English speaker will now be at a disadvantage in life and that is why learning English is good.
What is the best source to learn the IT in English language
English is a language used by business. It also has many great authors that have written in English from Shakespeare to Mark Twain. Learning English in England will give you a British accent. So the only disadvantage is if you wanted a job on American television, where they want an American midwest accent.
"Start learning the language!" in English is Iniziare ad imparare il linguaggio! in Italian.
No one can progress these days without learning English language and adopting the western culture
BBC - Learning English