+2. It would be wise to disable root access and to continue this tutorial with a user with sudoers group access
+
+3. Install certbot (choose instructions for nginx and your distribution) :
+[https://certbot.eff.org/all-instructions](https://certbot.eff.org/all-instructions)
+4. Install NodeJS 10.x:
+[https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions](https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions)
+5. Install yarn, and be sure to have [a recent version](https://github.com/yarnpkg/yarn/releases/latest):
+[https://yarnpkg.com/en/docs/install#linux-tab](https://yarnpkg.com/en/docs/install#linux-tab)