So this is a radar plot of a number of attributes that the person that has made it has selected (seems an odd selection to me, so.might have been done just to make Messi look good)
Usually these kind of plots are scaled so that a full segment on the radar represents being >95% in the attribute being measured compared to the entire population that you have considered (in this case probably players in big 5 leagues or something similar).
The categories are, going clockwise from the top.
Goals per 90 minutes played.
Expected goals per 90
Shots per 90
Assists per 90
Expected assists per 90
Key passes per 90
Xgchain - which is a measure of how someone contributes to all the moves that his team has that result in a shot, not counting the xG of the shot itself
Xgbuildup - which is something similar