Toe
The angle of the wheels relative to the chassis centreline when seen from above. Toe-in (fronts of the wheels pointing together) tends to add straight-line stability and calm initial response; toe-out tends to sharpen turn-in at the cost of stability and a little drag. Front and rear play different roles: front toe shapes steering response, rear toe-in is the usual stability margin for the driven axle. Large values at either end cost rolling drag and tire temperature.
Effect by corner phase
Front toe-out tends to make turn-in keener; rear toe-in tends to keep the car straight under braking.
Rear toe-in tends to stabilise the car as power goes down, at a small drag cost.
Symptom tendencies
These describe tendencies, not rules.
Entry understeer, or lazy initial turn-in on an otherwise balanced car Entry
A small step toward front toe-out tends to sharpen response — expect slightly more nervousness on straights.
Verify on track before you commit to a change.