So I have this ring in my inventory called “Crystal Bangle” It has +10 Maximum attack and +14 Evasion
I know Evasion makes it so I can dodge attacks, but what does Maximum Attack do?
What does the Stat do in general and is it useful? I haven’t exactly found another item that has Maximum Attack so I kept it on the belief that it’s actually really good. Any ideas?
It increases your maximum damage. You can check on the stats window that your Physical Attack has a range min-max. When you attack the game uses that range to generate your damage so increasing your maximum Attack makes you hit harder sometimes.
Physical Attack or Str is better if the amount is at least half of what you have with Maximum Attack because with those stats the increase is for every hit unless you have a skill that makes you hit always your Max damage.
I understand now, Thank you very much 
Maximum attack stat also increases magic damage.