Once you've chosen a good case then the motherboard is your next step. It's what brings all of the components (processor, memory, video card, etc.) together to work as a system. It's the most important part of a computer system because it's what's everything plugs into. Make sure you choose one that fits your case and is compatible with all the components you're working with. Every motherboard is different so do some research to find the right one for your needs. Don't stress. We're here to help!