This video shows how to build a no-code app to send a custom reply to a Twilio text message. The code tutorial mentioned is here: https://www.serverless.com/blog/serverless-and-twilio.
Technical note: Twilio expects a specific response from a Webhook. This response includes a message to send back. This no-code examples works differently. While Parabola does send a response from a Webhook, the response is just a default success message (this causes an error on Twilio side which you can see in the debug console). The no-code example sends a new message as a reply to the received message.