Summarize this article:

The first time you make a map, it's a set size; you can increase the size of the map up to four times (doubling it each time), allowing for a more comprehensive map of the world. You cannot expand a map in the Legacy Console versions of Minecraft. This is the version of Minecraft that was originally released for the Xbox 360/One and the PlayStation 3/4. You'll need eight pieces of paper for each zoom level (up to 32 pieces total). If you don't have at least 8 pieces of paper, craft more before proceeding. Select the crafting table to do so. If you're using Minecraft on mobile, you'll need an anvil for this step instead. Click your map, then click the center square in the crafting grid. On mobile, tap the left-most square on the anvil's interface, then tap your map. Click your stack of paper, then right-click each empty space around the map at least once. On mobile, tap the middle square in the interface, then tap your paper. You should see a yellow map icon appear to the right of the crafting interface; click it, then click your inventory.  If you added two or more pieces of paper to each crafting square, you can add back the map to create another zoomed-out version. On mobile, tap the resulting map in the far-right box to move it into your inventory. By placing the zoomed-out map back in the center of the crafting grid and surrounding it with paper again, you can zoom out your map once again. This process can be repeated up to three times after the initial expansion. to document more of the world. By equipping the map and walking around with it, you'll be able to add the world's landmarks to the map.

Summary:
Understand how expanding works. Craft more paper if necessary. Open your crafting table. Place your map in the middle. Surround the map with paper. Move the resulting map into your inventory. Repeat this process up to three more times. Use the map