Hi Brian, yup usually it's good to leave both Object Snap and Straight Snap on most of the time.
But sometimes when you're drawing curves you might find that you can't place a point quite in a location that you might want for shaping the curve because it's snapping to other points in that general neighborhood. If that happens then holding down Alt is a quick remedy for that, since it only disables the snapping while the key is held down and will return to regular operation once you release the Alt key.
- Michael
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