Install SSL Let's Encrypt on Ubuntu - nginx web server

 1. Install certbot and nginx plugin

    - sudo apt install certbot python3-certbot-nginx -y

2. confirm your web before install SSL

    - sudo nano /etc/nginx/sites-available/test.com

3. Check syntax errors

    - sudo nginx -t

4. Reload nginx

    - sudo systemctl reload nginx

5. Check firewal, if active allow https

    - sudo ufw status
    - sudo ufw allow 'Nginx Full'
    - sudo ufw delete allow 'Nginx HTTP

6. Obtaining an SSL Certificate

    - sudo certbot --nginx -d test.com -d www.test.com

7. verify auto renewal

    - sudo systemctl status certbot.timer

8. Test renewal proccess

    - sudo certbot renew --dry-run

DONE

NOTE: - First, pointing yourdomain. example: www.test.com test.com to public ip address
             - For another domain, follow just step 6