Schenveningen for dummies: (self included)
White's ideas include pawn breaks to e5, f5 (and fight for d5 by removing pawn) and g5.
Black may try: P - b4 as part of an attack on white's e pawn, d5, or e5 for a blockade. Black has good chances on the queenside using his open bishop file.
White often advances his f pawn. This weakens his e pawn and opens a diagonal along f2 - b6 with attack chncs for black.
Hats off to Andrew Soltis, Pawn Structure Chess, who I summarize in detail.