Configure NGINX web server to use SSL

You need an installed NGINX web server
You also need an SSL key and certificate, but you can use Let's Encrypt for signed SSL certificates as well.
Copy the certificate and key to /etc/ssl

Configure the server to serve an SSL site:

cat > /tmp/ssl<< EOF
server {
    listen 443 ssl http2;
 
    ssl on;
    ssl_certificate /etc/ssl/certs/cert.pem;
    ssl_certificate_key /etc/ssl/private/cert.key;
 
    ssl_ciphers 'kEECDH+ECDSA+AES128 kEECDH+ECDSA+AES256 kEECDH+AES128 kEECDH+AES256 +SHA !aNULL !eNULL !LOW !MD5 !EXP !DSS !PSK !SRP !kECDH !CAMELLIA !RC4 !SEED';
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_session_timeout 5m;
    ssl_session_cache shared:SSL:10m;
 
    ssl_stapling on;
    ssl_stapling_verify on;
 
    ssl_prefer_server_ciphers on;
    ssl_dhparam /etc/ssl/certs/dhparam.pem;
 
    add_header Strict-Transport-Security max-age=63072000;
    add_header X-Frame-Options DENY;
    add_header X-Content-Type-Options nosniff;
 
    keepalive_timeout 90;
 
    location / {
        proxy_set_header X-Real-IP \$remote_addr;
        proxy_set_header X-Forwarded-For \$remote_addr;
        proxy_set_header Host \$host;
        proxy_pass http://127.0.0.1:80;
    }
}
EOF
 
sudo mv /tmp/ssl /etc/nginx/sites-available/
 
sudo ln -s /etc/nginx/sites-available/ssl /etc/nginx/sites-enabled/ssl
 
cd /etc/ssl/certs
sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 4096
 
sudo service nginx reload