15-minute session: read for 3 minutes, trace for 3, experiment for 7, and complete the check for 2. Spend longer whenever you need.
A server OS combines a kernel with boot and service management, storage, networking, accounts, updates, and recovery. Building a server distribution is different from writing a new kernel. Choose which goal your project has. Draw the request path from a network interface through a service to storage, and mark every trust boundary.
Practice and evidence: Predict the example or draw its state transitions. Change one assumption, test the boundary, and record the actual result. Explain what this small model does not establish about a production system.
Keep three notes: your prediction, the actual result, and why they match or differ. The completion check grades understanding; the practice task builds skill.