Exfoliation

in general you're not encourage to exfoliate everyday. it still depends on the product concentration u use, the type of acid u use and your skin type. BHA more than 0.5% shouldnt be used everyday. AHA of more than 4% cant be used everyday too (if not mistaken,im not so sure about AHA). PHA is generally very gentle and can be used everyday. while for LHA, it depends on the concentration as well but generally its quite gentle so if your skin is able to handle then its okay. its important to let your skin restore itself and rest as well

No, it may irritate your skin. Try 2x/3x a week

It depends on the percentages of the exfoliator, the formula and your skin type.

no. it might harm to skin. make your skin irritated, breakout, and damage skin barrier

depend on what exfo you used and your skin type and concern. some of the exfo product developed to be used daily, like the wishtrend facewash that include exfoliating properties but it still depend on your skin.