[Back In The Saddle]

The general case is that you'll throw it in at the nearest spot OOB.

For over and back, inbounds at the spot nearest to where the violation occurred (which will be where the player touched the ball).

For a travel in the middle of the court, you're probably going to the nearest sideline.

For an OOB violation, it's where it went OOB.

If you're in the frontcourt, then try and picture this:
Form two triangles by drawing an imaginary line from each end of the free throw line to the nearest corner of the baseline/sideline. If the violation/foul occurs in the paint, in the free throw semi-circle, or in either of the triangles you just imagined, the throw-in will be on the baseline. Otherwise it's a sideline throw-in.