I need help deploying my vidly app

In the deployment section of React Mosh used Heroku, Mlab, and MongoDB. Unfortunately, I can no longer use Heroku because it is no longer free. I have tried multiple times without success and I was charged regardless.

Now I have decided to use Vercel but I cannot find any resources online on how to deploy my frontend and backend successfully and for free on Vercel.

Please can you share with me any resources that can help me to deploy my frontend and backend? I have been trying to do this for months now and it is very frustrating.