Create and run a .NET 8 solution containing a console project in a local development environment.

Create a GitHub repository and use branches, commits, and pushes to preserve project changes.

Implement a restaurant order calculation using C# types, nullable values, conditions, and loops.

Model menu items, customers, and orders as C# classes with constructors, properties, and methods.

Apply encapsulation and enums to enforce valid state in a restaurant domain model.

Use generic collections to store and process menu items and order lines.

Query in-memory restaurant data with LINQ filtering, projection, ordering, and aggregation.

Handle invalid input and domain failures with appropriate C# exceptions.