Many things can cause skipped stitches.
Needle size being to large, in light fabrics, so the thread does not have enough friction through the fabric during the up lift of the needle to create the loop to be picked up by the hook is one.
Needle not installed exactly with the hole perpendicular to the hook is another, the long continuous slot on the needle should be towards the thread entry side.
very basic timing: the needle eye should meet the hook point after about 1/16 inch up from bottom needle position, straight stitch and longest stitch selected. Timing is usually not off
What type of machine is this, make and model, does it have a rotating or oscillating hook?
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