Code organization & reuse-- Overview-- Write Section

[nicolejadeyee]

TL;DR: There are several strategies you can use to factor Lit code into reusable modules.

• Directives are special functions that customize how an expression is processed and rendered.
• Class mixins are factory functions that add a specific set up functionality to a base class.
• Lit Reactive controllers are objects that can hook into a host component's update lifecycle.