Fixed appliances are heaters, air conditioners and hot water systems, permanently attached or built into the building shell. 

Plug-in appliances are devices connected to power source, constantly drawing power - like fridges, freezers, chargers, etc and appliances working in  standby mode (TVs, sound, AV, microwave, etc). Appliances using power on demand (lamps, toasters, power tools, hair dryers, etc) are generally not considered in our reports unless they consume considerable amount of energy when used. 

Behavioural power usage is due to "human factor" - individual preferences or habits of people living in the house. Adjusting the way the power is used, without impact on comfort or health, could lead to developing power saving habits (closing door to unused rooms, turning off the lights when not in use, etc)