Since my wife started using QGIS I've tried to find ways to help her streamline her work. Creating and using themes is probably one of the simplest ways and it's such an underused and undersold feature of QGIS that I had to write about it.

And yes, I know the maps are horrifying to look at, but I was rushing a short post and didn't waste a lot of time on choosing colors.

https://bogind.blogspot.com/2021/10/using-map-themes-in-qgis.html