could any one of you explain these things:
1. What is "signifier" and "signified"? Can you explain in simple language but elaboratively?
2. What is the notion of Saussure about these terms?
3. What is the notion of Derrida about these terms?
4. How did Derrida attack on the notion of Saussure's "Signifier" and "Signified"?
5. Is there any elimentary self-learning book for beginners of theory?