This page offers a breakdown of the DIY recipes for Shovels.
The Flimsy Shovel DIY is first given to you by Blathers when he sets up a tent on your island. He asks you to fetch him some fossils and gives you the recipe for one.
To craft a Flimsy Shovel, you need 5 pieces of hardwood, which are obtained from trees using an axe.
The Flimsy Shovel is very fragile and will break after hitting a few boulders and digging up a couple of fossils.
You can purchase the Pretty Good Tools from the Nookstop in Resident Services for 3,000 Nook Miles. To craft the standard shovel, you’ll need to first craft a flimsy shovel and then use iron nuggets to upgrade it at the craft bench. You can obtain iron nuggets from hitting a boulder with a shovel.