Hook
The shot starts near your target line, then curves sharply to the left, often diving quickly into trouble.
Why it happens
An overly closed clubface relative to the swing path at impact, commonly from a strong grip combined with active hand rotation through the ball.
Possible causes in your swing, and how to fix each one
Tap any cause to see its fix. Work through them one at a time, usually one or two are the real culprit.
1Grip too strong
Seeing 4+ knuckles on your left hand at address tends to deliver a closed face by default.
2Hands flipping through impact
Trying to add power by actively rotating the hands closes the face faster than the body rotates.
3Excessively in-to-out path
4Ball too far back with quick hands
Catching the ball early in the arc, before the club has squared up, with active hands closes the face further.
When to stop self-diagnosing
If you've genuinely worked through two or three of these causes over several range sessions and the miss keeps showing up, that's not a failure since it usually means the real cause is something you can't feel or see in your own swing. A single 30-minute lesson with a certified instructor, who can watch you hit balls, will find it faster than any website. Bring this page along and tell them what you've already ruled out; it'll save you both time.