I’m pretty new to crypto and have a serious question

How are people so confident about where graphs will go next? I will see 10 posts pop up IMMEDIATELY when there’s a 2-3% move in any direction.. with any crypto.. CONFIDENTLY state how that particular coin will carry on… breaking them or making them a million. Then the comments that follow are ALL the same.. some claim they have been calling said action for months… some say the opposite is true and then the rest say everyone is stupid because all crypto is worthless.

Almost every day on every related sub. Where does the confidence come from?