Okay kiddo, the golden pagoda is basically a big shiny temple in Namsai. It's called the "golden" pagoda because it's covered in gold color which makes it look really pretty and shiny.
A pagoda is like a tall tower that people use for prayers and other worshiping activities. In this specific pagoda, people pay respect to a Buddha statue inside.
Namsai is a place in India where people who follow Buddhism live. It's a very peaceful and holy place where people often visit to meditate and learn about Buddhism.
So, in short, the golden pagoda in Namsai is a beautiful temple where people go to pray and worship. It's made of gold color and is very significant to the people who follow Buddhism in that area.