It is quite a task to ask someone to explain Piaget's work and its development and perhaps criticisms by other researchers. That is an awful amount of work to do just to help you. If you have looked at Piaget's work and you have some difficulties somewhere, it might then be reasonable to ask for help. I only consulted Piaget's article entitled: La mesure de la sensation (in French), published in Traite de la Psychologie, 1:68-87 (1974). It may give you a clue on what to do.
It has been about 20 years since I used Piaget's work: Piaget muted a framework for the evolution and functioning of intelligence that embraced 4 stages: the Sensorimotor Stage (birth - 18 months; the Preoperational Stage (18 months - 7 years); the Concete Operations Stage (7-13 years), and the Formal Operations Stage (13 years onward). Here's a few references to be going on with: Piaget, J. (1970) "Extracts from Piaget's Theory", in Richardson & Sheldon (1988): Cognitive Development to Adolescence: A Reader, Lawrence Erlbaum Associates Ltd., Hove, In association with The Open University; Piaget, J. (1977): "The Stages Of Intellectual Development in Childhood and Adolescence", in Gruber & Voneche (eds.), The Essential Piaget, Routledge & Kegan Paul, London. Also take a look at Piaget-Vygotsky: The Social Genesis of Thought, Psychology Press. An imprint of Erlbaum (UK) Taylor & Francis Ltd., Hove.
Recently the review of general Psychology has accepted a my paper about this subject and particularly about the relationship between Bowlby and Piaget. You will find it on line very early