SSL for websites, shops and mail
Choose SSL by domain count, subdomains, validation type and deployment model: a simple site, shop, customer panel and branded e-mail may need different certificate paths.
DV, OV, EV, wildcard and multi-domain
DV confirms domain control, OV and EV add organization validation, wildcard covers subdomains, and multi-domain SAN protects several names with one certificate.
Deployment with hosting, DNS and HTTPS
Certificate deployment should include DNS, www and non-www variants, HTTPS redirects, mixed content, mail, webmail and automatic renewal checks.