First thing you need to understand are candles. Candles make up charts. Each candle is a specific unit in time. Charting tools such as Trading View allow you to view candles for many timeframes. You can look at a candle on the weekly, daily, 4 hour, 1 hour, 30 minute, 15 min, 5 min, etc etc. 

The structure of a candle tells you data on what happened to price during the formation of the candle. No matter the time frame, candles look the same. Here is the structure of a candle. The green (Bull) candle represents price going up during that time period and a red (Bear) one represents price going lower during that time period.

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1. Open — The price at which a candle opens during its forming period (it is also where the previous candle closed)
2. High — The top of the candle, which is the highest point of price during that period
3. Low — The bottom of the candle, which is the lowest point of price during that period
4. Close — the last price at which a candle is traded during its forming period