Loaders have been discussed in detail in previous chapters of this guide. However, we have only alluded to the customization or authoring of them. This will be increasingly important to at least demonstrate your mastery of Webpack, so we should discuss it now. 

The following tutorial will be structured like this:

• Setup
• Simple usage
• Complex usage
• Guidelines

The Guidelines section will itself be subcategorized, but for now, let's begin with the setup.