How to make a Shangshui stone bonsai? A detailed step-by-step tutorial

Shangshui stone is also called water-absorbing stone (a natural air purifier). It is called this because after water is stored in the pot, Shangshui stone can absorb it to the top in an instant. Wild grass and moss can be planted on the stone, making it verdant and lush; it is an excellent stone material for making bonsai. In essence, Shangshui stone is sand-accumulated stone, loose and brittle, with particularly strong water absorption.