Ethereum Smart Contract vulnerabilities and exploits

A smart contract is a computer program that executes the terms of and triggers an agreement between two or more parties, in which all the terms are recorded on a blockchain. Smart contracts have the potential to make transactions both simpler and cheaper by automating complex agreements. However, because they are represented as code on a blockchain, there is always some risk involved with them – particularly if they don't have proper security.

The guide talks about common smart contract vulnerabilities that will help you write secure smart contracts.