This is a very thorough guide to the SEO side of HTTPS migrations

https://outspokenmedia.com/https/

What is content consolidation?

How consultants like Outspoken Media help companies create authoritative, useful and evergreen content by combining, updating and improving existing website content.

https://outspokenmedia.com/services/content-consolidation/

Google Search Console Checklist for HTTPS Migrations
Here are five vital things you should do in Google search console before you switch your site to HTTPS.

https://outspokenmedia.com/https/google-search-console/

Upgrade Insecure Requests

The upgrade-insecure-requests directive tells browsers to load your page resources using HTTPS even if your page is still using "HTTP" (non secure) requests. An almost magical way to automatically fix most mixed content issues while you are migrating to HTTPS.

https://outspokenmedia.com/https/upgrade-insecure-requests/

Sitemap considerations for a HTTPS migration
Having a well planned and executed sitemap solution for your HTTPS migration results in faster indexing of your new urls and a much less frustrating experience.

https://outspokenmedia.com/https/sitemaps-https-migration/

OCSP Stapling: What it is and why to use it
Did you know that your traffic is relying on third party servers that you do not control? If you are using HTTPS, web browsers are checking if that certificate is valid using third party servers (run by certificate vendors). If you use OCSP Stapling those third party servers will not have to be checked each visit and you can enhance to performance and privacy of your traffic.

https://outspokenmedia.com/https/ocsp-stapling/

What is OCSP?

OCSP is a method used by web browsers to check if certificates encountered in HTTPS connections are still valid.


https://outspokenmedia.com/https/ocsp/

Robots.txt considerations when migrating to HTTPS
Things to consider about the small but mighty robots.txt file when you are planning to switch to HTTPS.

https://outspokenmedia.com/https/robots-txt-https-migrations/

How to see HTTPS Details in Chrome
There is a great deal of information about the security of your connection in the Chrome browser. The Chrome developer tools Security Panel displays protocol, cipher, key exchange, certificate details and more.

https://outspokenmedia.com/https/google-chrome-security-details/

How blocked resources affect a HTTPS migration
There is really no good reason to have any blocked resources. It is against the Google webmaster guidelines, they are easy to find (in Google Search Console) and they are easy to fix. If you are migrating to HTTPS it is wise to fix them before you switch. This article explains why.

https://outspokenmedia.com/https/blocked-resources/