Transform

Flip (H&V)

Flip turns selected path points over, like a mirror. Use Flip H for left and right, and Flip V for up and down.

All keys

Flips the path on every keyframe.

Simple

Flips the selected path points at the current time or on the selected keyframes.

Guarded

Flips the path while trying to protect the animation around the current keyframes.

Bake

Bake turns expressions into normal keyframes.

Linear

Turns expressions into keyframes at a fixed frame rate.

Smart

Turns expressions into keyframes, but only adds the keys it thinks are needed.