What does this below rebus puzzle mean?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

What is black when you buy it, red when you use it, and gray when you throw it away?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What number when divided in half becomes zero?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.