Following the cultutal in etiquette will help you have a peaceful and happy life in Thailad.
These ate the things you need to follow in Thailand ;
Remove your shoes: As in many Asian cultures, removing your shoes before entering a temple or visiting someone's home is essential. Some businesses, restaurants, and shops also ask that you remove your shoes. If unsure, just look to see if there is a pile of shoes at the entrance, or check to see if the staff are wearing shoes.
Use your right hand: The left hand is considered dirty, as it is sometimes used for "toilet functions." Always use your right hand to pass objects to someone and when paying. Touch your left hand to your right forearm (showing that it is safely out of reach) if you wish to show extra respect.
Eat with a spoon: The proper way to enjoy delicious Thai food is with the spoon in your right hand and fork in your left. Use the fork to rake food onto your spoon; the fork never goes into the mouth. Chopsticks are usually only used for noodle dishes and treats such as spring rolls.
Show respect to monks: You will encounter many monks in places such as Chiang Mai; treat them with respect. When greeting a monk, be sure to show respect, and monks receive a higher wai than ordinary people; monks do not have to return your gesture. Women should never touch a monk, brush a monk's robes, or hand something to a monk. Monks should be allowed to eat first at ceremonies and gatherings.
Smile: The "Thai smile" is famous, essential to Thailand etiquette, and Thais show it whenever they can. Always return someone's smile. Smiles are used during negotiation, in an apology, to relax whenever something goes not as planned, and just in everyday life.