Reflect on the concept of lines and quadratic functions. What concepts (only the names)

Reflect on the concept of lines and quadratic functions. What concepts (only the names) did you need to accommodate the concept of lines and quadratic functions in your mind? What are the simplest line and quadratic function you can imagine? In your day to day, is there any occurring fact that can be interpreted as lines and quadratic functions? What strategy are you using to get the graph of lines and quadratic functions?
The Learning Journal entry should be a minimum of 400 words and not more than 750 words.