You have 3 options to setup SSL certificate for your domain:
- By one from DNS service provider (e.g Godaddy).
- use certbot utility on the server.
- install and use Caddy server.
Note: SSL is not related to the programming language used, its more of how clients(browsers) communicate with web server (web apps/sites). and yes you can use it locally on your machine.
Cool, Thank for the answer. I meant that the users don't have any connection with the service. it's a landing page. And more one question: Buying from DNS provider will always give me the SSL certificate ? No matter what's going on with the backend in case the web do use it ?
yes, but if its ok you can use certbot or Caddy, they are free and really recommended, as I remember the only down side of using certbot is that, you have to renew every 3 months, not sure about caddy maybe it will mange the renewal process for you.