The Reasons it's Important to Learn why English is important to learn.

There are lot of people in the world speaking different languages as well as those who study new ones. In new and the modern world English has become became a part of our lives as  life since it's widely spread across the world. If you know English you can travel abroad, find new friends more easily, enjoy your favourite TV shows/ music without waiting till it's translated into your mother tongue target language, get a well-paid job, get an access to more recourses on the Internet which are written in English and so on. I know there are much many more reasons which that I didn't mention here but I think they are less important or not? I don't know. In any case those who'll be reviewing this may add some of their own to this list. For me that It would be interesting to read other people's reasons and arguments about this statement.
Yet I don't know how to end up this piece of writting so I will just leave it unsigned.

The reasons why English is important to learn.

There are a lot of people in the world speaking different languages, as well as those who study new ones. In the new and modern world, English became a part of our life since it's widely spread across the world. If you know English you can travel abroad; find new friends more easily; enjoy your favourite TV shows/music without waiting untill it's translated into your target language; get a well-paid job; gain access to more courses on the Internet which are written in English, and so on. I know there are many more reasons which I didn't mention here, but I don't think they are as important. I don't know. In any case, those who'll be reviewing this may add some of theirs to this list. For me it would be interesting to read other people's reasons and arguments about this statement.
Well, I don't know how to end this piece of writing, so I'll just leave it unsigned.

Very good! The only thing that really stood out here was that you used a comma instead of a semi-colon in your list. It still made perfect sense, but when you are writing long lists you should use a semi-colon after each item. A comma is better used to indicate a pause.