Okay kiddo, let me explain what khuddaka nikāya means. Khuddaka nikāya is a collection of different Buddhist scriptures that are considered to be small or little. Just like you have a basket where you keep your little toys, this collection is like a basket where different short texts are kept.
These texts include stories, sayings of Buddha, poems, and other teachings. They are written in a language called Pali, which is an ancient language from a place called India where Buddha lived. These texts are one of the important parts of Buddhist teachings and are used by people who follow Buddhism to learn and practice their beliefs.
Just like your little toy basket, this collection of texts may be small but it is very important to followers of Buddhism.