This may be boring for you more designy/less handy folks, but it’s what we’re working on at the moment. In this case, we happen to be creating the slab to use as the bottom step of the basement stairs.

Check out this video if you want to learn how to set up the form for a concrete slab pour. If you’re working on an entire floor, you would do something like this on a larger scale. The room can be broken down into smaller slabs and joints can be filled in later.