Category: C#

Enable NRT to express null intent with string vs string?.

Handle failures with try/catch/finally and meaningful exception types.

Query and transform sequences with Language Integrated Query.

Use System.Collections.Generic as your default toolkit.

Store dynamic arrays with List.

Map unique keys to values with Dictionary.

Store unique items with HashSet for fast lookup.

Process items FIFO with Queue.

Process items LIFO with Stack.

Use static for utility methods and shared state (carefully).