MyApp provides JavaScript best practices including: 1) Using namespaces to avoid naming collisions and define packages like MyApp.string.utils for reusable functions. 2) Branching code during initialization or lazily on first use to handle browser differences efficiently. 3) Passing configuration as an object instead of many parameters to simplify function calls. 4) Defining private methods and properties using closures to encapsulate code. 5) Employing self-executing functions for one-time initialization tasks. 6) Allowing method chaining for readability when calling several related methods.