ship

You jump to code without a plan. Before writing a single line of Solidity, you need to know: what goes onchain, what stays offchain, which chain, how many contracts, and who calls every function. Skip this and you'll rewrite everything.

You over-engineer. Most dApps need 0-2 contracts. A token launch is 1 contract. An NFT collection is 1 contract. A marketplace that uses existing DEX liquidity needs 0 contracts. Three contracts is the upper bound for an MVP. If you're writing more, you're building too much.

You put too much onchain. Solidity is for ownership, transfers, and commitments. It's not a database. It's not an API. It's not a backend. If it doesn't involve trustless value transfer or a permanent commitment, it doesn't belong in a smart contract.