Glass blocks are cool because they offer so many creative, decorative, and useful options in Minecraft. You can make a few types of glass. How and when you use glass blocks or panes is up to you, but generally blocks are better for large projects (such as building walls) and panes are better for smaller projects (such as windows). But it’s perfectly fine to use them any way you like.
Follow these steps to make 1 block of glass:
Break a block of sand, and pick it up by walking over it.
You can use regular or red sand — the kind of sand you choose doesn’t have an effect on the glass itself.
Mine coal and pick it up.
Go back to your house, and then right-click on the furnace to access it.
You use the furnace to smelt sand into glass.
Place the sand in the top box and the coal in the bottom box.
Wait until the sand is smelted, and then take the glass that appears.
Glass panes are similar to glass blocks, but they look more realistic — like the windows you’re used to seeing in your real-life house. Panes are also different from blocks because you can break them and pick them up as an item, just in case you mess up. (When you break glass blocks, they don’t drop as an item; they just disappear.)