Reference Books and Articles

More about SSL (Technical version) - Learn more about the SSL/TLS protocol and implementing HTTPS with a technical overview.
Best practices when implementing HTTPS - Google's tips for SEO best practices when switching to HTTPS from HTTP.
HTTP Strict Transport Security - Learn about HSTS and how to enable it for HTTPS websites on various web servers.
SSL/TLS Deployment Best Practices - SSL is easy to deploy, but not easy to deploy correctly to provide the necessary security.
SSL Implementation Best Practice for Mobile App development - Best practices for using web server certificates with mobile apps.
SSL Threat Model - Large image indicating potential threat areas in the SSL security ecosystem, consisting of SSL, TLS and PKI.
About Public Key Pinning - Learn to configure your web server to validate itself using HTTP Public Key Pinning (HPKP) Pin Validation.
Secure Your Web App With HTTP Headers - HTTP response headers can be used to tighten security of web apps with a few lines of code.
Everything you need to know about HTTP Security Headers - Shows how to configure HTTP security Headers on web servers.
Security Guidance for E-commerce Websites - Updated PCI best practice guidelines [PDF] for securing e-commerce transactions.

GoDaddy - GoDaddy allows third-party SSL certificate installs on some of its products.
BlueHost - BlueHost allows third-party SSL certificate installs on some of its products.
HostGator - HostGator allows third-party SSL certificate installs on some of its products.
ZenCommerce - Zencommerce allows third-party SSL certificate installs on the e-commerce stores hosted with them.
AWS Certificate Manager - If you need to use non-EC2 AWS services then you need to use Amazon Certificate Manager.
Microsoft Azure - Microsoft Azure allows third-party SSL certificate installation.