Dear sir
I have gap between the upper teeth what is the solution for this and this just starting how to solve

The space could be closed by seeing an orthodontist and have braces put on or see a dentist who specializes in cosmetic dentistry to see if he/she could place crowns on your front teeth closing the space. You really need to have a thorough assessment by a qualified dentist.

Talk to your dentist.

If you're young, braces would probably be the solution.

If you're older and the gap is really big, braces would still be the answer, but if it is minor gap, veneers or bonding would help.