50 years ago, Thais lived with local nature and food from each area of the country. Thai food is not homogenous. Northern Thai food is different from Western Thai food. The beauty and variation of each food comes from each ethnicity within Thailand.
However, all places in Thailand have food in common that will change based upon the season.
Experiencing seasonal dishes is the best way to experience Thai food. Last but not least, there are also a number of popular Thai dishes that you can enjoy throughout the year.