What is the defficiency or over nutriment and how to correct it ?

Nutrient burn - too much nutrients - leaf tips are the big indicator Feed plain, pH adjusted water. Ideally RO water. Try to avoid tap water. It’s nothing you can’t correct, and more importantly avoid doing again in the future. If you are going off a bottled liquid nutrient feed schedule, try starting at 1/4 strength recommendation and max 1/2 strength recommended. You can always apply more nutrients if you see deficiencies, generally cannabis plants this small don’t need a lot of nutes to produce big fat healthy frosty buds. Good luck you will be fine.