Optimism
How does Optimism's Rollup really work? https://research.paradigm.xyz/optimism
OVM Deep Dive https://medium.com/ethereum-optimism/ovm-deep-dive-a300d1085f52
Optimistic Ethereum Documentation https://community.optimism.io/docs/
Arbitrum
Arbitrum Developer Quickstart https://developer.offchainlabs.com/docs/developer_quickstart
Arbitrum in under 10 minutes https://tracer.finance/radar/arbitrum-in-under-10/
Medium
Cartesi Rollups https://medium.com/cartesi/scalable-smart-contracts-on-ethereum-built-with-mainstream-software-stacks-8ad6f8f17997
Rollups on-Chain https://medium.com/cartesi/rollups-on-chain-d749744a9cb3
Cartesi Rollups Rollout — State Fold https://medium.com/cartesi/state-fold-cfe5f4d79639
Cartesi Rollups Rollout — Transaction Manager https://medium.com/cartesi/cartesi-rollups-rollout-transaction-manager-4a49af15d6b9