Scrollable Lists and Conditionals

Use listView Widget to have scrollable list, and use Container with fixed height and Expanded to nest it.

How to optimize the ListView loading performance?

If the list is too long, the rendering will be tedious, how to achieve dynamic rendering?:
Automatically build items scrolled in. (Dynamic rendering).ListView.builder.

Conditional Inline ternary expression *proposition* ? do(if so): do(if not)