Basic OpenSSL commands you can use in your day to day job when it involves working with SSL/TLS certificates. For example you use OpenSSL to get a certificate's SerialNumber or to verify the SAN (Subject Alternative Names).
The following PowerShell snippet can be used to quickly install an SSL (or TLS) certificate in Windows Server. It assumes you have a PFX file and its password. The default location is Cert:\LocalMachine\My, to use for IIS websites.
Set up HTTP Strict-Transport-Security (HSTS) response header in Windows Server IIS 10, here is some more technical information about HSTS in IIS, and other security headers...
