The "Rock N Stones Essentials Pack" usage guide;

The 2 main methods of using this asset pack.

The 1st method is to append the "Photini By Design Rock N Stone GN Scatter" object, or append the "Photini By Design Rock N Stone GN Scatter" node tree into your blender project. To apply the geometry nodes rock and stone scattering system to your active mesh object, simply navigate to Properties on the right hand side of blender's UI, go to the modifiers tab, click Add Modifier and select Geometry Nodes, then click the Icon to left of the New button and select Photini By Design Rock N Stone GN Scatter from the drop down menu.

The 2nd method is to import or append the "Photini By Design Rock Scans" and "Photini By Design Stone Scans" collections into your blender project, and then manually place the objects in your scene, or distribute them by using a Particle System or your own custom built Geometry Nodes setup.

Performance / Poly Count / Optimization

Each rock and stone object has a Decimate Modifier attached by default to reduce the poly count for those with less powerful computers. For those with better performing computers, you can choose to disable the Decimate Modifier in view port and/or upon render, or choose to remove the modifier completely.

I have made a short visual guide on YouTube which is linked to this listing, feel free to check it out.