the Course Handicap needs to be correct (if it is absent, or too high in that you receive too many strokes, then DQ). Also will need the correct gross hole scores (too low and DQ) and signatures (usually both marker and player, but probably only one required at the moment due to Covid).
Index and Playing handicaps are optional, and you cannot be punished for totalling your scores up incorrectly or getting Stableford points wrong.