Здравствуйте всё! I'm new here (obviously) and I was wondering if you guys could help me figure something out. Sometimes I see "всё", sometimes "все", and seemingly the words mean the same thing in the sentence, so what's the difference? I've noticed it in other words too (where "ё" replaces "е" and vice-versa), like "Чёрный" и "Зелёный" for example. Is it just personal preference or does it change the meaning?

Спасибо!