There a many different ways to construct a fire pit, from a simple ring of stones to something with more modern aesthetic like this poured concrete version. While the project is labor-intensive, you can build it in a weekend for around $150.
If you’ve never worked with concrete before, this gives a basic overview on how to build a form, prep the ground, and pour concrete from a bag mix. These principles can be used for all types of indoor and outdoor projects, and you don’t need much more than a form, wheelbarrow, and garden hoe for mixing the concrete. You can see the full list of materials and a step-by-step tutorial at the link below.
Concrete Fire Pit | Home Made Modern