Every object has default styles and settings that you should become familiar with, and learn to configure for best results in your projects. However, it is not practical to try and master these for all objects as you learn to design with Autodesk Civil 3D. Instead, become familiar with the default styles for objects and labels in your template and over time modify them to suit your needs.
Create a default style for initial object creation, then others for different stages of the design process, for different users, for different types of analysis, and for final presentation purposes. For many objects, the default styles may be adequate and you will require minimal changes as your requirements evolve.
As with object styles, create different label styles for different stages and purposes in the project lifecycle. During the design phase, use simple, fast-drawing labels for most objects to display only the essential data that supports the design process.
Best practices for the use of styles involve making additional styles available for composite drawings, turning layers off in some contexts to hide labels, and perhaps having multiple label styles on different layers.