Book / course on best practices?

[abcoathup]

It is also worth looking at the list of post-mortems:

List of Ethereum Smart Contracts Post-Mortems

Note: Also check our Compiled List of Solidity Vulnerabilities. When things go wrong with the development, testing and auditing processes, vulnerable contracts are deployed to mainnet and go into production. These vulnerabilities are then either found by the good hackers and the project is patched, or they are exploited by the bad hackers and the project crashes. Sometimes weird things happen, when the definitions of good, bad, and crash are not very clear. But this is how we learn. Things …