How to setup www vs non-www, http vs https for SEO

When learning about SEO, you have probably read that you should only use www or non-www and only http or https. This begs the question: What does “only” even mean? Does it mean in all your blogs and PR events you must link consistently to https://www.example.com or is a forward from http://example.com to https://www.example.com good enough? My research […]