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There are basically three types of gaps encountered in charting.
They are Breakaway, Continuation and Exhaustion Gaps.
Breakaway gaps occur when a stock has been trading sideways and the price "breaks away" in one direction or the other.
A Continuation gap occurs in a trend and the share price will gap in the direction of the trend.
An Exhaustion gap occurs in the direction of the trend but at or near the end of a run.
The only gap that has to be filled is the exhaustion gap. If this gap were not filled it would be a continuation gap.

Hope this helps. If not google it.

Good luck and good buying.