A top-level .htaccess file on the web server can contain the following:

SetEnv no-gzip 1
Options -Indexes
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.example\.nl$ [NC]
RewriteRule ^ https://www.example.nl%{REQUEST_URI} [R=301,L,NE]
Redirect 302 /.well-known/security.txt https://elsewhere.nl/.well-known/security.txt
<IfModule mod_headers.c>
  Header always set X-Content-Type-Options "nosniff"
  Header always set Referrer-Policy "same-origin"
  Header always set X-Frame-Options "SAMEORIGIN"
  Header always set Permissions-Policy "camera=()"
  Header always set X-XSS-Protection "1; mode=block"
  Header always set Strict-Transport-Security "max-age=63072000; includeSubDomains" "expr=%{HTTPS} == 'on'"
  Header always set Content-Security-Policy "default-src 'self'; base-uri 'self'; font-src 'self'; form-action 'self'; frame-ancestors 'self'; img-src 'self' data:; object-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline';"
</IfModule>

Notes:
1. in case of WordPress, such rewrite/redirection to www is not applicable.
2. Also see our pages set-up-security-headers and solve-directadmin-issues.
3. This previous way by me of redirecting ignores a specific page:
<If "! (%{HTTP_HOST} =~ /^www\.example\.nl$/)">
    Redirect 301 / https://www.example.nl/
</If>