- Kevin023May 2019
Do you mean the differences between "e", "é" and "è"? If so, it's mainly about the "degree of openness" of your mouth and/or lips. The position of your jaw contributes to produce a different sound. I suggest you check the phonetic alphabet to know how to pronounce these different vowels.
Here is a nice article on the polyglot wiki about the different regional French accents : check it out https://polyglotclub.com/wiki/Language/French/Pronunciation/France-Regional-Accents