To use splines effectively for roto, you should follow some best practices and tips. When selecting the type and number of control points, consider the shape and motion of the object you are masking. Fewer points work better for simple shapes, while more points are needed to accurately capture complex shapes. Adjusting the curve handles and tangents can help to fine-tune the shape and direction of the spline. For sharp corners or edges, use linear or constant tangents, while smooth or bezier tangents are better for smooth curves or transitions. When animating the spline, keyframe each control point separately instead of the whole spline. Move the points along the contour of the object, adding or deleting points as necessary. Avoid moving the points perpendicular to the motion as this can cause interpolation problems. Finally, check your animation on different frames and views, using onion skin or roto overlay features to compare it with the footage, and motion path or curve editor features to edit it.
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