2 documents. Basically A lab test result for the PCr test and a Dr certificate that you don't have covid (as per PCR result) and that you are fit to fly.
Emirates wanted both when I flew, but Thai immigration only wanted the PCT test certificate
20 year Elite Visa, Get a job here,. Marry a Thai, Education Visa. Special Tourist Visa and tourist visa. In order of length of stay (roughly). Plenty of choices really