The wording is fine, but - Studying a literary text is a hard task [add a comma here], but with help of linguistic’s tools such as politness [use lower case here], it becomes easy and simple. Use a comma because you are linking two independent statements with "but". Use lower case because "politness" is not a proper noun.

It should be '..but with the help of linguistics tools..' It could be ..but with help from my teachers..' ('from' should be what someone gives you) :)

I think it's all correct, but you could say "easier" or "easiest" instead of just "easy". to express that it becomes more/most easy than what it was before.