Learn to build effective cybersecurity detection capabilities using free and open-source tools in this 44-minute conference talk from BSides San Antonio 2025. Discover practical detection engineering techniques and methodologies that don't require expensive commercial solutions, exploring how to leverage freely available security tools to identify threats and anomalies in your environment. Gain insights into creating robust detection rules, implementing monitoring strategies, and developing a security operations mindset using accessible resources. Master the fundamentals of threat detection while understanding how to maximize the effectiveness of cost-effective security tooling for organizations of any size.