right. You’ll have to provide company data proving you are employed and authorized to work remotely. If you’re doing it for yourself only, that doesn’t count as “remote work”.
If you “work” as a freelancer providing none-institutionalized investing “advice” that’s most likely considered illegal and will earn you a lightening fast application rejection.
You just need comfortable clothes, a visa or Mastercard credit/debit card, and you'll get a visa exemption stamp when you pass through the passport check (no hassle). Just make sure to say "60 day visa" maybe they'll give you 60 days instead of 30 (worked for some people). Enjoy Thailand!