How can I redirect mydomain.tld to www.mydomain.tld?

[kanhu]

@self-hosted

Domain + subdomains for same site + https

hi, i am trying to configure www.MYWEBSITE.ORG and MYWEBSITE.ORG for the same Wordpress/Yunohost install. what i want a) www.MYWEBSITE.ORG shall be main domain b) MYWEBSITE.ORG shall redirect to it what is the way to do ? what shall i configure in YUNOHOST and what shall i configure in NGINX and what shall i configure in my DNS i would like to have LET"S ENCRYPT certificate for both domains or just for the main one.