know about GAPS
Gaps occur when either the low for the current bar or candle is above the high for the previous bar/Candle or the high for the current bar/candle is lower than the low of the previous bar/candle. Figure 3.29 pictures a gap down. The "hole" or "void" created in the price history is a "price range at which no shares changed hands" (Edwards and Magee, 2003).