- Values, variables, constants, and zero values (Locked)
- Control flow: for is the only loop you get (Locked)
- Functions: multiple returns, closures, and defer (Locked)
- Pointers without fear (Locked)
- Strings, runes, bytes, and formatted output (Locked)
- Slices, and how they really work (Locked)
- Maps, structs, and modeling your first feed item (Locked)
- Module quiz (Locked)
- Goroutines and the scheduler (Locked)
- Channels: send, receive, range, close (Locked)
- Fan-out and fan-in: fetch every source at onceFree
- Select, timeouts, and cancellation with context (Locked)
- Sharing state safely: the sync package (Locked)
- Putting it together: the concurrent aggregator (Locked)
- Module quiz (Locked)
- Panic and recover: at the boundary, never as control flow (Locked)
- Table-driven tests and benchmarks (Locked)
- Fuzzing the feed parser (Locked)
- go mod deep dive: sub-packages and project structure (Locked)
- Writing the HTTP server (Locked)
- Testing HTTP handlers (Locked)
- Logging, metrics, and configuration (Locked)
- Where to go next (Locked)
- Module quiz (Locked)