instruction

a message describing how something is to be done; "he gave directions faster than she could follow them"

the activities of educating or instructing; activities that impart knowledge or skill; "he received no formal education"; "our instruction was carefully programmed"; "good classroom teaching is seldom rewarded"

the profession of a teacher; "he prepared for teaching while still in college"; "pedagogy is recognized as an important profession"

(computer science) a line of code written as part of a computer program