This video is a thorough introduction to the Grasshopper parameter objects. These objects introduce data to the definition. Parameter objects work as container capsules, storing data in Grasshopper. This data can be inherited from Grasshopper or referenced from Rhino or external sources. Some input parameter objects have the ability to interact with data as well.
COMPONENT PALETTES:
Params: Geometry, Input, Primitive, Utilities
COMPONENTS:
Number Slider
Data Dam
Graph Mapper
File Path
Read File
ADD-ONS:
Bifocals: https://www.food4rhino.com/app/bifocals
LINKS:
Add-ons: https://www.food4rhino.com/
Forum: https://discourse.mcneel.com/
Grasshopper component library: http://grasshopperdocs.com/