That's partially correct!
According to Lev Vygotsky's concept of the "Zone of Proximal Development" (ZPD), learning is most effective when:
The Content is Slightly Beyond the Learner's Current Level of Ability
In other words, the ZPD refers to the range of tasks and activities that are:
Just beyond the learner's current ability to perform independently
Within reach with guidance, support, and scaffolding from a more knowledgeable other (e.g., teacher, mentor, peer)
This zone provides an optimal level of challenge, allowing learners to stretch their abilities, develop new skills, and construct new knowledge.