Not commenting code: Failing to comment code can make it difficult for others (or even yourself) to understand what the code is doing. Not testing code thoroughly: Skipping thorough testing can lead to bugs and other issues down the line. Not using version control: Using version control allows developers to track changes to their code and easily revert back to previous versions if needed. Not refactoring code: Not refactoring code can make it harder to maintain and can lead to code that is unnecessarily complex. Not staying up-to-date with best practices: Technologies and best practices in the field of software development are constantly evolving, so it's important for developers to stay current. Not considering security: Failing to consider security can leave vulnerabilities in the code that could be exploited by attackers. Not considering scalability: If a project is not designed to scale, it could become difficult to maintain as it grows. Not paying attention to performance: Poorly optimized code can lead to slow performance and a poor user experience. Not asking for help: It's okay to ask for help when you're stuck or need guidance. Not learning from mistakes: It's important to learn from mistakes in order to improve and become a better developer. By being aware of these common mistakes and taking steps to avoid them, intermediate developers can continue to grow and improve their skills.