I've been in Thailand fairly recently, and a lot of the scary scam warnings you see online feel pretty outdated. Most travellers never run into anything serious. The stuff that does still happen is usually low-key and easy to avoid.
The most common things are taxi or tuk-tuk drivers not using the meter, or offering a "cheap tour" that turns into stops at gem shops or tailors. Around big sights in Bangkok, you'll still occasionally hear the "temple is closed today" line, it's basically never true.
At beach destinations, jet ski or motorbike rentals can be an issue if you don't check the vehicle first. Take a quick video when you pick it up and you'll be fine. Tailors and gem shops aren't automatically scams, but hard sell or "special government promotion" stories are a good sign to walk away.
In nightlife areas, just watch for inflated drink bills or surprise charges, nothing unique to Thailand, really.
The more dramatic stuff you read about (fake police, airport cons, etc.) is pretty rare these days. Overall, Thailand is very tourist-friendly. If you ignore unsolicited offers and use common sense, chances are you won't experience any scams at all.