Nepal is home to more than 120 ethnic groups and languages, and while Kathmandu Valley communities are used to international volunteers, a little cultural awareness goes a long way toward building trust with your host family and community.
A few basics: greet people with "Namaste" and a slight bow with palms together, rather than a handshake, especially with elders. Use your right hand (or both hands) when giving or receiving something, including food and money. Remove your shoes before entering homes, temples, and some schools , watch for a shoe pile at the entrance as a cue.
Dress modestly, particularly when visiting temples or rural villages , shoulders and knees covered is a safe default for both men and women. Photography is usually welcomed, but always ask before photographing people, especially at religious sites.
Finally, patience is a virtue here , plans can shift with weather, festivals, or simply "Nepali time." Volunteers who arrive with flexibility and curiosity tend to get the most out of their placement, and the warmth of a Nepali host family more than makes up for the occasional delayed bus.