Any indication of courses on CHIANG MAI to take, that allow to apply for Visa? (Thai Massage / Culinary / Idioms / Tech)?

Ok, from my last post many people are recommending the DT visa when addressing Thai immigration not being happy with people using the visa exempt system too often. I mentioned we do not want to live n Thailand. We do not work in Thailand. And I am a didital nothing. So this leaves studying something as the only option to comply with the requirements of this visa category. I have no problems with this, I love learning new things. I would just like to ask others exactly what courses they have used to SUCESSFULLY meets this requirement? I appreciate your experiences and any help with this question.

Hello. Questions about student visa? Do I have to apply it here in my country or in Thailand once I am there?

I plan to learn and study Thailand language and culture, I hope you can also give me recommendations which school to apply. Thanks.