This lesson covers how the blockchain world is actually laid out today: the difference between a base chain (Layer 1) and the networks built on top of it to make it faster and cheaper (Layer 2), the rollups that dominate that scaling story, and the bridges that move assets between chains. The reason a trader cares is concrete: where a chain sits in this stack determines how fast a trade settles, how final that settlement is, and where the liquidity you want to trade against actually lives. Knowing the map, and where its danger zones are, is what lets you reason about settlement and bridge risk on a desk.
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