Hands-On Embedded Programming with C++17

Don't reinvent the wheel

If a library or framework exists that's of a good quality and available for your target platform and project license, use it instead of writing your own implementation.

Keep a library of commonly used snippets and examples as a reference-not only for yourself, but also for other team members. It's easier to remember where you can find an example of a feature than it is to remember the exact implementation details of that feature.