According to robert katz, which three skills do managers develop through education and experience?

Those three skills are:
Technical, refers to the expertise on relevant field for the managers. (for example manager of an drug company having expertise on microbiology) 
Conceptual , refers to the capability for abstract thinking. Will be useful in creating long-term plan
Human or interpersonal management skills. Refers to the capaiblity to motivate all employees to make sure they fulfilled all goals.