If you are using Lightsail AWS Server with LAMP Stack deployed and are wondering how can i enable SSL for my domains, its very simple.
The Bitnami LAMP Stack comes with command line tools to enable SSL using Lets Encrypt.
To launch the Bitnami HTTPS Configuration Tool, execute the following command on SSH and follow the prompts:
sudo /opt/bitnami/bncert-tool
It will start an interactive command line session with simple questions to configure SSL for your domain.