Today is my first day writing in English (here). Today is my first day writing in English here.

Today is my first day writing in English (here). Today is my first day writing in English (here).

i´mI'm also looking for more similar series. I'm also looking for more similar series.

iI´m looking for more similar series. I´m looking for more similar series.

"i'm" -> "I'm: capitalization

iI´m looking for more similar series. I´m looking for more similar series.

I think it´'s cliché to say that i´I'm using Friends (the series) just to improve my pronunciation, but that´s it, the series helps me a lot to pronounce and learn better. I think it's cliché to say that I'm using Friends (the series) just to improve my pronunciation.

I think it´s cliché to say that iI´m using Friends (the series) to improve my pronunciation, but that´s it, t. The series helps me a lot toin improving my pronounceiation and learn bettering. I think it´s cliché to say that I´m using Friends (the series) to improve my pronunciation, but that´s it. The series helps in improving my pronunciation and learning.

'I'm' always begins with the capital letter.

I think it´s cliché to say that iI´m using Friends (the series) to improve my pronunciation, but that´s it, the series helps me a lot to pronounce and learn betterI learn a lot from the series. I think it´s cliché to say that I´m using Friends (the series) to improve my pronunciation, but I learn a lot from the series.

"i'm" -> "I'm": Typo, but if this is a mistake, see end for explanation* but that´s it, the series helps me a lot to pronounce and learn better. -> but it helps me learn better.: We've already established that you're using Friends to improve your pronunciation, so we don't need to mention it again. *"I", the pronoun, is always capitalized no matter where it is in the sentence. Its conjunctions "I'm", "I've", "I'll", "I'd", etc. are also treated the same way.

I think it´s cliché to say that i´m using Friends (the series) to improve my pronunciation, but that´s ithe truth, the series helps me a lot to impronounceve my pronunciation and learn better. I think it´s cliché to say that i´m using Friends (the series) to improve my pronunciation, but that´s the truth, the series helps me a lot to improve my pronunciation and learn better.

"pronounce better" is fine grammatically, it's just a bit unnatural sounding.