Looking for a simple how-to to get started with a floorplan integration

I am new at HA and already have a lot implemented. So far so good. But I am now struggling with implementation of a floorplan. I have a floorplan picture. But then. I followed an old help file on youtube buit this is from 2017-2018. Where can I find a simple tutorial on how to implement a floorplan with some lights.

The Picture Element card does most of the stuff that Floorplan did. Since Picture Element cards are part of the Lovelace frontend, and Lovelace frontend became part of the standard hass.io build last year, Floorplan is not really necessary anymore.

Here’s the docs:

Here’s a great intro by Juanmtec: