DM Specific User ID on Discord.js Bot - discord

Question

i'm new to coding bots and i need help on how to add a command on messaging a certain person a customized message. this is what i have so far. what should i do?
const Discord = require('discord.js');
const config = require("./Data/config.json")
const client = new Discord.Client({ intents: ["GUILDS", "GUILD_MESSAGES"] })
client.once('ready', () => {
console.log('Ready!');
});
client.login('TOKEN');
client.on('message', async message => {
if (message.author.bot) return;
let prefix = '??'
if (!message.content.startsWith(prefix)) return;
let args = message.content.slice(prefix.length).trim().split("/ +/g");
let msg = message.content.toLowerCase();
let cmd = args.shift().toLowerCase();
if (msg.startsWith(prefix + 'ping')) {
message.channel.send('pong');
}
if (msg.startsWith(prefix + 'hello')) {
message.channel.send('hewwo uwu');
}
});

Answer 1

To fetch a user by id, you can use bot.users.fetch()
To direct message a user, you can use User.send():
const user = await client.users.fetch(userId);
user.send("This is a DM!");

Answer 2

This simple function will easily resolve the user (you can provide a user object or user ID so it’s very helpful)
async function DMUser(resolvable, content, client) {
const user = client.users.resolve(resolvable)
return user.send(content)
}
//returns: message sent, or error
//usage: DMUser(UserResolvable, "content", client)
Related links:
UserManager.resolve
User.send
UserResolvable