Level	Topics
Level 1 (Orientation)	TiKV101 What Is TiKV?
Level 2 (Ecosystem)	TiKV201 TiDB Ecosystem
Level 3 (Architecture)	TiKV301 Architecture
Level 4 (Fundamental)	RAFT401 Raft Crash CourseRAFTSTORE402 Raft Event LoopROCKSDB403 RocksDB IntroTXN404 Transaction Intro
Level 5 (Data Flow)	RAFTSTORE501 Write Flow 502 Linearizable ReadsCOP503 Coprocessor Intro
Level 6 (Core Mechanism)	RAFT601 Leader Transfer 602 Replica Movement 603 Raft SnapshotRAFTSTORE604 Region SplitROCKSDB605 RocksDB LSM TreeCOP606 Coprocessor PatternsTXN607 Transaction Scheduler
Level 7 (Detailed)	RAFTSTORE701 Batch System 702 Slow Score 703 Region WorkerROCKSDB704 RocksDB Details 705 TitanCOP706 YATP Read Pool 707 Coprocessor ExecutionTXN708 Async Commit and 1PC
Level 8 (Advanced)	RAFTSTORE801 Region Merge 802 Raft HibernationTXN803 In-Memory Pessimistic LocksROCKSDB804 GC and Compaction Filter
Level 9 (Peak)	RAFTSTORE901 Peer Lifecycle and Crash Recovery