What does the phrase “code is law” really mean?
Ethereum mainnet went live in July 2015, making it one of the earliest public blockchains capable of running Turing-complete smart contracts.
Before confirming a transaction, check the interaction target and the action your wallet asks you to perform. If you don't understand it, don't sign.
Deploying a contract on Ethereum requires paying $ETH in Gas.
Have you run into any pitfalls like these? Share them so others can avoid the same mistakes.

Stay calm and manage your position size.