I have a few existing HS200 smart switches, as well as the dimmer versions that work great.  These were installed by a handyman that has since retired.

Yesterday, a new handyman hooked up a brand new HS200 smart switch to replace an existing non-smart switch that controls power to an outdoor outlet.  This outdoor outlet has a LED transformer plugged into it that my deck LED lights are connected to.  The transfomer power is always set to ON, and the light switch turns on and off the outlet, which in turn turns on and off the lights.  When the handyman connected the switch he asked me if I kneww if the line/load terminals mattered as they both said line/load.  The switch powered up and I was able to configure it through the app.  I then turned the switch on and off and suddenly it stopped working - the light on the switch was no longer illuminated.  I could be wrong, but I believe the switch got "fried".  He re-connected my old non-smart switch with a timer, and of course it worked fine.  So, I'm guessing since he never installed this type of switch before, he did it incorrectly.  Before I find a third handyman/electrician, can someone in laymens terms give me a breakdown of which wire should go into which terminal on the switch. I do have a neutral wire.