What im doing wrong here

# 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(dictionary):
    num_teachers = 0
    for name in dictionary.keys():
        num_teachers += 1
    return num_teachers

def num_courses(dictionary):
    num_courses = 0
    for courses in dictionary.values():
        num_courses += len(courses)
    return num_courses 

def courses(dictionary):
    list_courses = []
    for courses in dictionary.values():
        list_courses += courses
    return list_courses

def moust_courses(dictionary):
    # Should return the name with the most courses
    the_name = ""
    num_courses = 0
    for name, courses in dictionary.items():
        if len(courses) > num_courses:
            the_name = name
            num_courses = len(courses)

    return the_name