Do I Need To Keep My Elbows Tight Against My Sides When Doing Bicep Curls

If your elbows swing so much that your risk hitting your face with it, then yes, keeping them tight against your sides is a good idea. But remember that in other biceps exercises like isolation or inclined curls, the elbows are not near the sides at all. When doing upright or seated biceps curls, I would encourage an elbow-along-the-side position (not tight against it) because it allows the biceps to move through its natural range.