1. SRE is the discipline of applying software engineering practices to solve operations problems to build reliable systems. 2. Service level terminology includes Service Level Indicators (SLIs) which are quantitative measures of service aspects like latency or error rates, Service Level Objectives (SLOs) which are goals for specific metrics, and Service Level Agreements (SLAs) which are agreements within an SLA. 3. Choosing the right SLIs, crafting meaningful SLOs, collecting indicator data, and meeting customer expectations through SLAs are important for building reliable services.