It’s easy on the pocket book and makes joining wood for drawers, cabinets, tables, and pretty much everything else easier.
Joining wood together is the crux of woodworking.  There are many ways to join wood but the most approachable and easiest to learn is using pocket holes.  And like most things these jigs come in different levels.  The Kreg R3 is the one I recommend for beginners.  It’s easy on the pocket book and makes joining wood for drawers, cabinets, tables, and pretty much everything else easier.