Six years ago iI visited to England with my brother, t. There iI got some understanding of the eEnglish language but since then iI haven't been able to keepcontinue learning it.

I'm trying to keep going using thisese kinds of sites.

One of the most difficult things is getting used to thinking and writeing in eEnglish.

Although i'I’m very excited about starting again this journey. again.

Starting aAgain

Six years ago i, I visited to England with my brother, there i got some. During my travels, I gained an understanding of the eEnglish language but since then i. Unfortunately, I haven't been able to keep learning it.

I separated your run-on sentence into shorter sentences. This makes it easier for others to read your work, especially in casual contexts.

I'm trying to keep going by using thisese kinds of sitwebsites/resources.

One of the most difficult things is getting used to thinking and writeing in eEnglish.

Although i'm very excited about starting againHowever, I'm enthusiastic about resuming this journey.

Starting aAgain

Titles are usually written in title case, which has special capitalization rules.

Six years ago iI visited to England with my brother, there i got and gained some understanding of the eEnglish language, but since then iI haven't been able to keep learning it.

This correction keeps the sentence together. Another option could look like:

Six years ago I visited England with my brother, and while I gained some understanding of the English language there, since then I haven´t been able to keep learning it.

I think the least drastic change would look like:

Six years ago I visited England with my brother. I got some understanding of the English language there, but since then I haven´t been able to keep learning it.

This last version could also use a semicolon instead of a period.

also, "gain understanding" is usually how it´s described

One of the most difficult things is getting used to thinking and writeing in eEnglish.

Since you´re talking about a situation where there is more than one difficult thing, "thing" should be made plural. Also, the "ing" form of the verbs "to think" and "to write" make more sense here.

Although iStill, I'm very excited about starting again this journey. again.

Although is sometimes used in this way, but it is more commonly used to connect two clauses of a sentence. For example, this would be more natural.

- Although I´m very excited about starting this journey again, one of the most difficult things is getting used to thinking and writing in English.

I just added "still" because it basically means "even though that is true, this other thing I´m about to talk about is significant as a main point."

Starting aAgain

Title capitalization rules

Six years ago i, I visited to England with my brother, t. There i got, I gained some understanding of the eEnglish language b. But since then i, I haven't been able to keep learning it.

To gain understanding is a common turn of phrase

I'm trying to keep going using thisese kind of sites.

Alternative: I'm trying to keep using this kind of site.

One of the most difficult things is getting used to think and write in eEnglish.

Although iI'm very excited about starting again this journey again.