XTL 0.72% 4,672.7 s&p/asx 20

Hi guys, new to charting. Just trying to get the basics together...

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    Hi guys, new to charting. Just trying to get the basics together so that I can trade with some sort of education under my belt, unlike the las few years.
    Have got my head around the solid/hollow green/red candles mean, how about the grey candles as per below?
    Chart is GCY, thinking of buying in.
    https://hotcopper.com.au/data/attachments/1424/1424125-9a5a305e31937d7c987142fa598cb9aa.jpg

 
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4,672.7
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33.200(0.72%)
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4,639.5 4,672.7 4,638.7
XTL (ASX) Chart
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