Heroku is the OG of affordable rails hosting. If the tutorial is older than 3-4 years ago then it was published when Heroku was free, which it no longer is.<p>There are lots of other affordable, but probably not free, options now;<p><a href="https://railway.app/" rel="nofollow">https://railway.app/</a>
<a href="https://fly.io/">https://fly.io/</a>
<a href="https://www.hetzner.com/" rel="nofollow">https://www.hetzner.com/</a>
<a href="https://www.digitalocean.com/" rel="nofollow">https://www.digitalocean.com/</a>
<a href="https://render.com/" rel="nofollow">https://render.com/</a>