The document discusses several key concepts related to understanding learners and learning processes. It defines individual differences as variations among people in aspects like intelligence and personality. It also discusses the role of rewards in motivating learning behaviors. Reinforcement is defined as something that increases the likelihood a behavior will occur again and can take tangible or intangible forms. Discovery learning engages students in developing their own understanding through experimentation. The zone of proximal development refers to tasks students can complete with guidance that help them develop further. Scaffolding provides support within the ZPD to help students learn independently over time.