Need help to edit NGINX config for SSL

I keep getting error when adding SSL syntax.

server {
listen 443 ssl;
server_name www.example.com;

ssl_certificate /etc/nginx/ssl/example.crt;
ssl_certificate_key /etc/nginx/ssl/example.key;

ssl_protocols SSLv3 TLSv1;

}

And also below crt files.. do I need to copy to /etc/nginx/ssl/ directory ?

AAA_Certificate_Services.crt
USERTrust_RSA_Certification_Authority.crt
Sectigo_RSA_Domain_Validation_Secure_Server_CA.crt

Thank you.

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