It's worth noting that there are differences in the use of words according to the gender of the speaker. Male speakers use the suffix "kab/krab", while women use "kaa" at the end of the sentence. Say "sawwadi kab/kaa" for hello, "arunsawat kha/krab" for good morning, "suwatdi ton bay kha/krab" for good afternoon, and "ratrisuwat kha/krab" for good evening. To say thank you, you can say "khob khun kab/kaa". If you want to shop, you can ask the price with the phrase "rakha thou rai kha". Finally, to say sorry or excuse me, you can say "kho thod kab/kaa".

The expression "sawadee kab" or "sawadee kha" in Thai means "hello" or greeting when you meet someone. The difference between the two versions of the expression lies in the gender of the speaker. "Sawadee kab" is used if the speaker is a male, while "sawadee kha" is for a female. So, if someone greets you with one of these expressions, you can reply with the same expression but according to your gender.

Some of the things you shouldn't do in Thailand include wearing immodest clothes to temples, touching people's heads, stepping on or folding Baht bills, stepping on ritual offerings, insulting the royal family, sitting or talking next to monks, and sitting down when the national anthem is being played.

Generally, there is no dress code in Bangkok. However, you should not wear revealing clothes to religious establishments. Make sure to cover your shoulders and knees when visiting temples.

The amount of tip given depends on the type of establishment. If you want to tip at a restaurant, you can give 10% of your total bill. For hotel services, such as bellboys, cleaning services, and others, 20 baht is generally a good tip. Meanwhile, when riding a taxi, you can round the fare to the nearest baht.