I was hoping I could get help. Can I use Let’s Encrypt on the domain I listed beneath, and how do I get started setting it up? It’s my first time during this. 
My domain is: casanovafurniture.dk
My hosting provider, if applicable, is: Dandomain
usually a google of tutorials + let’s encrypt + your webserver / hosting panel is a good start
without all the relevant information it’s a bit hard to point you down the right path
Andrei
If you are not running your own server, try contacting your provider first.