https://courses.lumenlearning.com/educationalpsychology/chapter/cognitive-development-the-theory-of-jean-piaget/
https://www.verywellmind.com/erik-eriksons-stages-of-psychosocial-development-2795740
https://www.simplypsychology.org/bandura.html
https://sites.google.com/site/cognitiveapproachtolearning/Behaviourist-Theory