this is true
yeah i'd agree. except that by definition that's not going to work out. for you to even make sense of the chart, you have to learn about things such as positioning and need some kind of basis that tells you why there's an opportunity present (e.g. "why do you think buying the dip can result in a profit?"). your understanding of positioning can either be fictitious ("rsi moving this way means institutional investors are selling blah blah") or can be rooted in some fact ("13f filings show that oaktree owns 47% of this one share and is trying to exit as it represents more than 10% of their gross fund value"). your assessment of opportunity also can be fictitious (e.g. Elder or some trading room dude) or based on empirical evidence (subsequent returns on stocks with positive time series returns tend to persist, and with frequent rebalancing, outperforms even during declines). All these things add up -- most traders have a mix of fantasy and facts in their mind and when they look at a chart and develop a view, it's going be based upon that.
my advice to new traders is to learn as many facts as possible and not stare at a chart because you cannot draw an any insights from it yet.