What is theare my reason about ls for learning English

ThOne reason is it has the benefit offor my future career because m. Most of the people in the world are usinguse English atfor work or in the studyies.

aAlso, l live in HongKong here. This is an international city and has a lot ofwith people from many other countries that all means l usually. The result is that l need to use English almost every day, so it is important for my life.

bBesides, l can receive more English information after l learned it better because often lwhen I have learned English better, I will have access to more information. For example, I am very interested to readin the English news, but l caright now I don't understand completely the means, so learning English also for my preference.it very well. So learning English is a personal preference as well as essential for work.¶

I hope I have understood what you wanted to say in your last line or two.

What is the reason about lfor me learning English?

Using the preposition "for" & the object form "me" in between "reason" and "learning" would be the most natural here. Note that, even though "me" is much more common, some English teachers/grammar checkers might only accept the possessive "my" as the correct form:

What is the reason for my learning English?

ThOne reason is it has the benefithat it will have a positive impact ofn my future career because most of the, given that most people in the world are usinguse English at work or in the studyacademics.

Because you give more reasons later, "One reason is" is better than "The reason is". I put a "that" in between "is" and "it" to make the sentence flow better, although it is optional.

The phrase "it has the benefit of my future career" suggests that the benefit *is* the your future career. What you're actually saying is, it will do good for your future career. Therefore, "have a positive impact on" is much more natural phrasing here.

"[B]ecause" is not the best conjunction to use here. Try using more diverse expressions such as the prepositional phrase "given that ~", although this is not absolutely necessary.

"most of the people in the world" -> "most people in the world"
"are using" -> "use"

"[I]n the study" sounds weird. "Study" as a noun like this sounds like "study room". What you actually mean to say here (I assume) is "academics".

aAlso, lI live in Hong Kong here. Hong Kong is an international city and has a lot of people from other countries t. That all means lI usually need to use English every day, it i. It's important.

"A" in "also" should be capitalized. Hong Kong should have a space in between Hong and Kong. We never say "here is an". We might say "It is an ~ here," but in this case "Hong Kong is an" is best. Don't make your sentences too long, break it up into multiple sentences.

besides, l canLastly, l will be able to receive more English information after lonce I've learned it better because often l. Oftentimes, I'm very interested toin read theing English news, but l can't understand completely the means, so learning English also for my preferencthe meaning completely. So, learning English will help me do something I like.

"Besides" is incorrect here. "[A]fter I learned it better" is incorrect; you should use the verb "have" + the past participle form "have learned" (or "have learnt"). You also have to match the tenses, so "will be able to" instead of "can". "I very interested" doesn't have a verb in it, which is obviously incorrect.

Now let's look at "I can't understand completely the means". "Means" is not a noun. You're looking for "meaning". Also, it's better if you put "completely" after "meaning" not after "understand".

"[S]o learning English also for my preference." This part doesn't have a verb either. "learning" by itself is not a verb, because it is in the present participle form. The way I phrased it is more natural.

What is the reason about lfor which l am learning English?

If you want to use a question as your title, you could rephrase like in the correction; an alternative, elegant way to phrase this would be "What is the reason for my learning English?" If you don't want to use a question, you could say "The reason I am learning English"

The reason is it has the benefit ofs my future career, because most of the people in the world are using English at work or in theto study.

aAlso, l live in Hong Kong here. This is an international city and has a lot of people from other countries that all, which means l usuallyoften need to use English every day, it is important.

"Often" instead of "usually" avoids repetition with "use". I think you don't need "it is important" at the end, this is implied in the rest of the sentence.

bBesides, l canwill be able to receive more English information after lin English once l have learned it better because. l am often l very interested to read the English news, but l cadon't always understand completely the means, so learning English also for my preferencewill also help with this.

Think it is better to break this into multiple sentences. "Preference" doesn't really work here - you could say "for my own leisure" but not sure this is needed as it is clear from the rest of the sentence