Is it true that Thai has no grammar? Can I just put words in any order and not bother with classifiers, etc.?

Answer 1

This is both true and untrue. There is no language without a grammar. There is a universal grammar working for all languages. Depending on from where one is looking at it, if one knows the nucleic elements of expressions then a grammatical form can come from many waypoints.

No classifiers, again, yes and no. Thai is full of noun-classifiers. To confer meaningfully one needs those classifiers, again, with the exception of social presuppositions and nucleation.