Developers increasingly face the challenge of managing sensitive data, commonly referred to as secrets, which include API tokens, security certificates, and credentials. These secrets often end up in source code and consequently in git repositories, posing a risk of leakage. GitGuardian, a security company, has analyzed data from 2020 to identify file extensions most prone to secret leaks, with the top 10 accounting for 81% of leaks. The main culprits include programming language files like Python and JavaScript, data serialization files such as JSON and XML, and forbidden files like .env and .pem. Hardcoding secrets into source code or configuration files is a prevalent issue, and best practices suggest using environment variables and .gitignore files to manage and protect secrets. GitGuardian's analysis highlights the importance of secret management and offers insights into preventing secret leaks by implementing security scanning and centralized management systems tailored to specific teams and technologies.