What is a realistic income for YouTube?

So, I'm curious about making money on YouTube - what kind of realistic income can one expect? Is it feasible to earn a full-time living from it, or is it more of a side hustle? Are there certain factors that play into determining how much you can make, like the type of content you produce, your subscriber count, and the engagement rates of your videos? And what are some common challenges or misconceptions that new YouTubers should be aware of when it comes to monetizing their channel?