Clarification needed

Question

The lesson for assignment operators was very short. what is the exact purpose of the assignment operators and how do they fit into programming.

Answer 1

Short & concise code is friendly to the eyes, and is a blessing especially to programmers that work for huge companies/contractors (due to dealing with several hundreds of thousands of lines of code, etc).

Answer 2

Assignment operators are simply to shorten your code and make it faster to write. I use them all the time.
a += 5 means a = a + 5
a -= 5 means a = a - 5
a *= 5 means a = a * 5
a /= 5 means a = a / 5
a %= 5 means a = a % 5