In this introductory talk, you will learn about fundamental principles of observability in modern system monitoring. We'll explore the core components of observability, including logs, metrics, and traces. You will gain hands-on insights into setting up Prometheus, a leading metrics collection and monitoring tool, to gather essential data from your applications and infrastructure. We will then dive into Grafana, an advanced visualisation platform, demonstrating how to transform raw metrics into informative dashboards and take data driven decisions.