sudo dnf -y install certbot

sudo certbot certonly --manual --preferred-challenges dns -d "*.[ hostname ]" -d [ hostname ]

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Please deploy a DNS TXT record under the name:

_acme-[ hostname ].

with the following value:

[ hash_id ]

Before continuing, verify the TXT record has been deployed. Depending on the DNS
provider, this may take some time, from a few seconds to multiple minutes. You can
check if it has finished deploying with aid of online tools, such as the Google
Admin Toolbox: https://[ hostname ]/apps/dig/#TXT/_acme-[ hostname ].
Look for one or more bolded line(s) below the line ';ANSWER'. It should show the
value(s) you've just added.

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dig TXT [ hostname ]
dig TXT [ hostname ] @short

# /etc/nginx/conf.d/[ hostname ]

server {
    listen 80;
    server_name [ hostname ];

    return 301 https://$host$request_uri;
}

# HTTPS server block
server {
    listen 443 ssl;
    server_name [ hostname ];

    ssl_certificate /etc/letsencrypt/live/[ hostname ]/[ hostname ];
    ssl_certificate_key /etc/letsencrypt/live/[ hostname ]/[ hostname ];

    ssl_protocols       TLSv1.2 TLSv1.3;
    ssl_ciphers         HIGH:!aNULL:!MD5;

    location / {
        root /usr/share/nginx/html;
        index [ hostname ] [ hostname ];
    }
}