mr. galgotia eats curd / yoghurt , in this case which tropic level he occupy ?

Mr Galgotia while eating curd occupies third trophic level i.e. secondary consumer.

Producer (grass)  – First trophic level

Primary consumer (cow) – Second trophic level

Secondary consumer ( man ) – Third trophic level

Here cow is eating grass (1st level). Grass transfers energy to the cow (2^nd level). The cow is producing milk from which curd is prepared. The person (3^rd level) is eating the curd. This means the energy is getting transferred from cow to man through curd.