Only 2 = Thai and English
Thai is the official (in Thailand)
English is the international. I studied from school-university and then learn from TV, newspaper, radio and internet.
And not enough to count in French, Dutch and Germany its necessary for my work. When we design the product’s label for export to EU market, we will ask our customers translate and support. So, I can spell and understand in the word about product name, ingredients, serving suggestion and etc.(need for label) but I can’t read its!!
IMO English is the most important for business, work and communication world wide. But don’t forget we have the “Body Language” or “Sign Language” more important too, don’t speak - no word but everyone understand. :thumb: