I've learned that english conversations goes well in English withoutwithout the use difficult words.

Recently, I have been watching a lot of movies and findnotice that the characters use a lot of simple words.

have been watching (present perfect continuous) - used for talking about repeated activities that is still continuing or a finished activity in the recent past.

Because of this, I might to change athe way ofI study English.

Added 'because of this' just to specify that you are thinking of changing the way you study because of what is stated on the last sentence.

I've learned that conversation goes well in English without difficult wordsdifficult words aren't required for good conversations in English.

Recently I've been watching a lot of movies and fiound that characters use simple words.

In the previous sentence, "I have learned" was used.

So in this sentence, "I have been watching" -> "I've been watching" is appropriate to match tense.

"find" -> "found": tense match

I might to change a way of studmy study strategy.

"to change a way of study" = infinitive

in this context, "a way of study" is your "study strategy".

I've learned that conversation goes well in English without difficult words.

Or: "conversation can go well"

Recently I watched a lot of movies and fiound that characters use simple words.

"watched" and "found" are in past tense.
You could also say: "recently I have been watching a lot of movies", this would mean you watched them in a period of time, which is recently.

I might to change amy way of study.

"might" is an auxiliary verb, this means it comes before a verb in a sentence. The verb here would be "change", so you can remove "to".
I assume you're talking about your personal way of study, so it would be better to say "my".

Recently I watched a lot of movies and fiound that characters use simple words.

Since you said "recently", you need to use the past tense for all your verbs.

I might to change amy way of study.ing.

You could also say "I might change the way I study".

Recently I watched a lot of movies and fiound that characters use simple words.

or "Recently I've been watching a lot of movies and find that characters use simple words."

I might to change athe way ofI study.