This document is by no means a comprehensive collection of functions on Hypar, but it's a good set of useful functionality to try out if you're just getting started.
Location Location lets you fill in an address, and get 3D building and topography context for your project.
Site By Sketch Site By Sketch lets you draw out a site boundary with a polygonal sketch.
Sunpath Diagram Sunpath Diagram shows you the sun's path for a given location and date.
Envelope By Sketch Envelope by sketch lets you draw a straight or stepped building mass, based on a polygon boundary in plan.
Envelope by Centerlines Envelope by Centerlines lets you draw one or more centerlines to produce a building envelope mass.
Sketch Masterplan Sketch masterplan is designed to allow quick massing and area studies of multiple building masterplans or campuses.
Simple Levels by Envelope Allows you to define building levels for a building envelope.
A more advanced function for creating levels, Custom Levels lets you import a CSV, and input levels relatively or absolutely.
Floors by Levels Floors by levels creates a floor for every level of your project.
Floors by Sketch Floors by sketch lets you draw each individual floor manually — useful for detailed space planning studies of one or two floors at a time.
Core By Floors Core by Floors will generate a best-guess core location given your project's floors, and allow you to add new core areas and change their size and position.
Space Planning Zones Space Planning Zones — a core component of the HyparSpace workflow — lets you take floors, generate or sketch circulation, and assign different program types to different zones.