discord.js how to let the bot send a message code example

Example 1: discord.js send message to specific channel

channel = client.channels.cache.get('757685515255545917');
    channel.send('Pong');

Example 2: how to use msg.send instead of msg.reply discord.js javascript

//this is an event listener
client.on('message', message => {
  // If message is ping
  if (message.content === 'ping') {
    // Send pong back
    message.channel.send('pong');
  }
});