Layer 2 Solutions & Scaling

Understand why blockchains need scaling solutions and how Layer 2 technologies — rollups, sidechains, Lightning, and modular data availability — make crypto faster and cheaper.

5 lessons · 1 hr 35 min · intermediate

1. 1The Blockchain Scalability ProblemLearn why blockchains like Bitcoin and Ethereum struggle with throughput and cost, the scalability trilemma, and why bigger blocks are not the answer.13 min
2. 2Rollups: Optimistic, ZK, and the Dencun UpgradeUnderstand how rollups work, the difference between optimistic and ZK rollups, and how EIP-4844 (March 13, 2024) cut rollup fees by approximately 90 percent.14 min
3. 3Lightning, Sidechains, Modular DA, and Account AbstractionExplore scaling approaches beyond rollups — the Lightning Network, sidechains, modular data-availability layers like Celestia, Cosmos IBC, and account abstraction.13 min
4. 4Comparing Layer 2s: A Practical User's GuideA grounded comparison of today's major Layer 2 networks: who leads on TVL, who is fastest, who is cheapest, who has the strongest security guarantees, and a practical decision framework for choosing the right L2 for your use case.26 min
5. 5Choosing Your L2: A Decision TreeA practical, worked-example decision framework for choosing among L2s. Cost, speed, security, ecosystem, liquidity, native tokens, withdrawal latency, sequencer risk, L2BEAT stages — applied to specific user scenarios with real-world bridging walkthroughs.29 min

Educational only — not financial advice.