What does this rebus riddle means ?

Decode below three cipher riddles:

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

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Can you start the fire using two pieces of wood?

Why 1729 is a magic number? Answer Logically.

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

Replace the question mark with the correct number in the below-given picture?

What is the riddle which can be asked all day with a different correct answer each time.

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?