General premise of andragogy (man-guide) stems from the realization that adults learn differently than children–pedagogy (child-guide). Adults have more experience with learning and knowledge acquisition. They also have different needs when it comes to what and how they learn.
https://elearningindustry.com/9-tips-apply-adult-learning-theory-to-elearning
http://www.muskegoncc.edu/Include/CTL%20DOCS/XXIX_No4.pdf
https://www.shiftelearning.com/blog/adult-learning-theories-instructional-design
https://www.ncolr.org/jiol/issues/pdf/6.2.3.pdf