I Build this bot by following discord.js Guide you can start there too :>.

to build run :

npm install

Don't forget to add .env file to your project root.

BOT_TOKEN="REPLACE THIS WITH YOUR BOT TOKEN"
GUILDID="REPLACE THIS WITH YOUR HOST SERVER ID"
CLIENTID="REPLACE THIS WITH YOUR BOT ID"

first you have to register slash commands

node ./deploy.js

now you can start your bot

node .

Discord.js