How do I find my network mask?

As a cryptocurrency and finance practitioner, I often need to delve into the technical side of things, even if it's not directly related to my field. One such question that has cropped up for me recently is, "How do I find my network mask?" It may seem like a basic networking query, but for those of us who aren't deeply entrenched in IT, it can be a bit of a mystery. So, let's break it down: How does one actually determine their network mask? Is it something that's readily available in the settings of my router or computer? Or is there a specific command I need to run? And once I have the mask, how can I ensure it's correctly configured for optimal network performance? I realize this isn't the most crypto-centric query, but it's one that's been piquing my curiosity. So, any guidance on how to uncover and understand my network mask would be greatly appreciated.