The is why? it varies on several factors
- it was not just because we read, we can perfectly understand it
- it is not just we know the tips/ideas, we can make them right as it matters in the decision-making and application
Honestly, it was too easy for us to say do this and this but feel it hard in an actual scenario. Most of us just noticed it was wrong when it was done already.
Yeah since we never know where the market movement then the near possibility that we can predict where the market moves is only from analysis, but in the end just like you said still many people fail at making decisions. Not because their decision is wrong but because the market is hard to predict and when we get wrong we can use that as our experience and keep growing, lots of things influence our decision making like our greed, lack of experience, panic, lack of patience, etc.