BEGINNER
How the Ethereum Virtual Machine works under the hood: accounts, transactions, gas, smart contracts and the execution model every EVM chain inherits.
What the EVM is, the world state it maintains, and how bytecode executes.
The two account types, how transactions move state, and the nonce machinery that prevents replays.
Solidity fundamentals, storage layout, function semantics and the failure modes you'll meet in production.
What gas pays for, the EIP-1559 fee market, and the optimisation patterns that move the needle.