Honestly, in tourist areas like Sukhumvit, Silom, and the Old Town, you’ll get by perfectly fine with just English. Most people working in hotels, restaurants, and malls speak enough English to help you out. Even on public transport, signs are usually in both Thai and English, so navigating is pretty easy. That being said, it’s always appreciated if you can learn a few basic Thai phrases, like “hello” (Sawasdee) and “thank you” (Khop Khun). People will smile even if your pronunciation isn’t perfect!