What percentage of Edge/Value or expected value should I consider good to bet using the value betting strategy?

Hi, I’m new on value betting and i already read the articles about value betting here at rebel
but i come with a question that can find a anwer and i would like to hear from yours:

I would like to better understand the selection criteria for a value bet. I know that as soon as we find a Edge or positive expected value in a certain event we should bet on it but I would like to understand this margin more deeply, for example is a Edge of 1% worth it? or 20%, in short, can someone tell me what are the positive Edges or values ​​that really bring profits in the long run.