In this lesson, I will show how how to enable SSL for free using let's encrypt. By following this lesson you will be able to able get https for your site free.
add-apt-repository ppa:certbot/certbot
apt-get update
apt-get install python3-certbot-nginx
sudo certbot --nginx -d example.com -d www.example.com
Replace example.com with your domain name. It will ask some questions just answer the question.
SSL has been enabled for your sites.
Open Crontab:
crontab -e
Paste the following command to crontab.
0 12 * * * /usr/bin/certbot renew --quiet