I didn't get the quotient and remainder part

Answer 1

Quotient & Remainder are basic Math logics
See this example, you must have done that in school
5
--------
4 | 22
| 20
--------
2
If you divide 22 by 4
your quotient is 5
and remainder is 2

While in programming in python we use (//) for getting quotient or whole number value while dividing
and (%) for remainder

22 // 4 = 5 (To get Quotient)
22 % 4 = 2 (To get remainder )

Answer 2

For example:
42 // 9 is 4 (the quotient)
42 % 9 is 6 (the remainder)
because 42 is 9*4 + 6, and 0<=6<9.