How to Redirect HTTP to HTTPS & Configure SSL/TLS in Nginx

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server {
    listen 80;
    listen [::]:80;
    server_name example.com www.example.com;

    # Permanent redirect to HTTPS
    return 301 https://$host$request_uri;
}

server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name example.com www.example.com;

    # SSL Certificates (e.g. Let's Encrypt Certbot)
    ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem;

    # Modern TLS protocols and high-security ciphers
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
    ssl_prefer_server_ciphers off;

    # SSL Session Caching for faster handshakes
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 1d;
    ssl_session_tickets off;

    # HTTP Strict Transport Security (HSTS)
    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;

    root /var/www/html;
    index index.html;
}