What are things i can do to lose weight and take vitamin d capsules?

Yes, ? D-Irrelevant: Losing weight about less food in, especially all carbs (means sugar: all forms), especially the most simple carbs, moderate protein & fats (of natural origin, not-processed, least fattening). Key is quantities (not calories: measured in a calorimeter) below current body usage. Track & record body wt to 0.1 lb daily to verify status, progress. But none of this much to do with vitamin d, d2 or d3.

Eat less/exercise: Weight loss is diet and exercise. Eat less than you burn off. It's 3500 calories to the pound. It has absolutely nothing to do with vitamin d.