why did olympics originate in gree and how it was resumed in 1896 finally how olympic games differ from any other sporting game
The history of the Olympics can be analyzed at this website. It provides information on the ancient Olympics, its origins, etc.
https://www.athens2004.com/en/OlympicGamesHistory/indexpage
As for the difference in the sports, there is not much difference. The same sports are usually played at a World Championship level between each Olympic games. The rules for each sport may differ slightly at a country level, but there are rules that are followed at the World level, and there may be variants that are only used during the Olympics.