Swift

Range
Closed / Half-open
Logical

Ternary Conditional
Nil-Coalescing
Identity

Types
Modulus
Rounding

Assigning
Decomposing

Declaration
Concatenation & Interpolation
Iterating
Formatting

Declaration
Notation

Booleans

Comments
Landmarks
Markdown

Getting started with:
… simple naming style guidelines
… data types
… declarations.