One of my biggest struggles has always been to understand the logic behind the changes in spelling and accents for certain verbs in the present indicative - doubling consonants or changing the accent on the letter “e”. It is not easy to find a comprehensive explanation about these changes. Instead we are just told to “memorize” the conjugations, which is frustrating.
I have searched many, many sites and textbooks, and knew that there was a reason related to pronunciation and syllable stress. I finally found a site that explains this pretty well. Perhaps this is self-evident to others, but it was not to me, and i thought it might help those like me! I hope you can access this link if you are interested!
https://languagecenter.cla.umn.edu/lc/FrenchSite1022/VERBCONer.html