Cobblestone slabs are used in decoration. To make Cobblestone Slab, you just need Cobblestones . Please follow the following steps to make Cobblestone Slab.
In order to make Cobblestone Slab, the basic item you will need is cobblestone. You have to find and get at least three cobblestones using your pickaxe.
After collecting cobblestones you need to use the crafting table to craft cobblestone slabs. Go to the crafting table and open up 3*3 crafting grid. Add three cobblestones in any row of the grid and you will get six cobblestone slabs in the right-side box of the crafting table. Don’t forget to bring these cobblestone slabs in inventory. Slabs are useful in making buildings.