find ip addresses on switch

No one good way to do this, depends on variables. Some commands may help 

sh ip arp (only works if you have l3 interfaces in each vlan)

sh ip dhcp snooping binding (needs dhcp snooping)

sh ip device tracking interface gigabitEthernet 

Good video explaining HSTS for customers

 https://www.youtube.com/watch?v=Jx5NEOI_TPw&t=9s

Although some of it is specific to the company platform the explanation of the HSTS and why its an issue is good.

HSTS

HTTP Strict transport security

Any site that redirects from HTTP to HTTPS is vulnerable 

Its medium severity usually but low hanging fruit for attackers, if they see the basics are not done they may probe further but if they see HSTS setup they may move on

HSTS is a protocol sets regulations for how user agents (web browsers) should handle their connection for a site running https

Its possible for attackers can downgrade https to http connections and read data