What is the word or phrase?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

There are two guys standing face to face in a room. On a wall, there is a clock. One of those is a prophet. He tells the other guy that he will be stabbed in the back in five minutes.

Shocked to hear that, the other guy stares at the clock. Just after the five minutes, he is stabbed on the back. Can you tell what happened?

The more of this there is, the less you see. What is it?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?