How to interpret this qqplot? I wonder how to interpret this plot. I know, in general, that a qqplot depicts the quantiles of the data against the quantiles of the normal function.
How do I apply this to this plot?


I explain how to read qq-plots in general here: QQ plot does not match histogram, and walk through constructing one here: PP-plots vs. QQ-plots.  Those posts may help you.
Because your data are on the vertical axis, when we see the top right points above the line, we can conclude that they are too far out relative to a true normal, whereas the lower left points aren't far enough out.  That is, your data are positively skewed relatively to a true normal.  In addition, we can see that the points at the bottom turn perfectly horizontal.  That means there is a floor that your data don't drop below.  These could be data that cannot be negative, for example.
