cant believe that most of every step of this challenge I need help

# The dictionary will look something like:
# {'Andrew Chalkley': ['jQuery Basics', 'Node.js Basics'],
#  'Kenneth Love': ['Python Basics', 'Python Collections']}
#
# Each key will be a Teacher and the value will be a list of courses.
#
# Your code goes below here.
def num_teachers(a):
    return len(a)
def num_courses(dic):
    number = 0
    for v in dic.values():
        number += len(v)
    return number
def courses(dic):
    course_list = []
    for v in dic.values():
        course_list.append(v)
    return course_list    
def courses(dic):
    course_list = []
    for v in dic.values():

        for a in v:
            course_list.append(a)
    return course_list
 def most_courses(dic)
    m_courses = 0

    for k , v in dic.items():
        if len(v) > m_courses :
            m_courses = len(v)
            teacher = k
    return teacher