The webpage for steemit.chat should work on an Apple product without any issue.
Residential security as in physical security for houses. Most people who study physical security do it for corporate customers since the pay is way higher (1K/Day). I'm not in this for the money those. My objective is to help people secure their homes and properties. Think barriers, lighting, cameras, alarms, etc. Some of my earlier posts begin to introduce the concepts.
Depending on what state you are in, you should consider becoming a PI. Many states make it difficult unless you are former LEO, but some states like Virginia allow anyone who takes a state controlled training course eligible.