Web sockets with nest.js

Hi people, i am a junior back end developer, i am from brazil so sorry if i comit a mistake writing in english.

I am i a new job and the technologies used are: Nest.js and Knex. My first task is create a websocket in nest, i am a little lost in how to start, i have a notion of node, javas and express. Someone can help me giving tips of good courses of NEST ?