Mine stone blocks with a pickaxe to get cobblestone
Smelt cobblestone in a furnace to get stone
Use a blast furnace or smoker only for their specific items, not stone
Find stone naturally in caves, mountains, and underground areas
Use Silk Touch on a pickaxe to mine stone directly
Trade with villagers if they offer stone-related items
Get stone from chests in generated structures
Use commands in Creative mode or with cheats enabled to give yourself stone