Answer:
Left to right Iām quite bright. Right to left I might bite.
What word has kst in the middle, in the beginning, and at the end?
I open wide and tight I shut, Sharp am I and paper-cut fingers too, so do take care, I'm good and bad, so best beware.
I have rivers without water. Forests without trees. Mountains without rocks. Towns without houses.
Tool of thief, toy of queen. Always used to be unseen. Sign of joy, sign of sorrow. Giving all likeness borrowed.
What is so fragile that saying its name breaks it?