Unfortunately, I am very lay about programming. I only know what I see on youtube.
What do you recommend me?
The SSL Certificate is free and I installed it through a youtube tutorial that showed how to install it through Certificates Provided by INFINITYFREE itself.
I see you did install an SSL certificate for advogadogoiania.cf, but not for advogadoimobiliariogoias.com. Please note that an SSL certificate is only valid for the domain name it’s issued for. Additional domain names need their own SSL certificates.
If by “website” you mean “account”, then yes, you can do that. Assuming you have less than three hosting accounts right now, otherwise you can’t create any additional accounts.