This is a key skill for anyone who wants to become a profitable trader. Clearly theres much more that goes into reading charts than just what is here but this is the key foundations of reading how price works and how to make trade entries with a good chance of profitability.
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Please check out my other videos posted recently where I talk about both fundamentals and review one of my recent trades investing in the stock market.
The aim of using the trend line is to simplify the trend, and map multiple candles direction. With a line chart you would still experience the noise as the line chart reacts to each candle close.
Its still important to keep the detail of the candles when entering a trade however.