PLEASE EXPLAIN AND ELABORATE VERY WELL. Thank you

1. Explain the meaning of the phrase "ignorance of the law excuses no one form compliance therewith." (5 points) 2. What are the sources of law? (5 points) 3. What is the highest of law of the land? Why? (5 points) 4. What is the title of Republic Act No. 386? When did it take effect? (5 points) 5. Where can we find the law on obligations and contracts? (5 points) 6. What is an obligation? (5 points) 7. Why is an obligation a juridical necessity? (5 points) 8. Why is an obligation "not to give" not mentioned in the definition stated in Article 1156? (5 points) 9. What are the essential requisites of an obligation? (5 points) 10. What are the sources of obligation? (5 points)