Understanding the differences between the categories of aviation will give you a better chance of making the most informed decision of the type of aviation you want to be a part of and better selecting the path of aviation training you want to begin with.
Visual Flight Rules (VFR) refer to a set of regulations under which a pilot operates an aircraft in weather conditions generally clear enough for the pilot to see where the aircraft is going. On the other hand, Instrument Flight Rules (IFR) are the set of regulations that govern aircraft operations when the pilot is unable to navigate with visual reference to the ground.
Airspace refers to the portion of the atmosphere controlled by a country above its territory, including its territorial waters or, more generally, any specific three-dimensional portion of the atmosphere. It is an invisible infrastructure that is crucial to manage because of the variety and volume of aircraft in the sky at any given time.