# ✅ Learning Checklist: Substrate + Aura + GRANDPA - [x] What is a blockchain - [x] What is consensus - [x] Types of consensus: - [x] Proof of Work (PoW) - [x] Proof of Stake (PoS) - [x] Proof of Authority (PoA) - [x] Nakamoto consensus - [x] BFT consensus (e.g. PBFT) - [x] Hybrid consensus - [x] What is Byzantine Fault Tolerance (BFT) - [x] What is a fork - [x] What is a produced (built) block - [x] What is a finalized block - [x] What is a validator - [x] What is Substrate - [x] Node vs Runtime - [x] What is a pallet - [x] What are extrinsics - [x] What is Aura consensus - [x] What is GRANDPA consensus - [x] How Aura + GRANDPA work together
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