Please compare and contrast the major types of random sampling and non-random sampling.

1-Please compare and contrast the major types of random sampling and non-random sampling. Why is random sampling the preferred method of getting a sample? 2-Explain the benefits and drawbacks to cross-sectional and longitudinal designs. 3-Explain why we need to operationalize (i.e., create operational definitions) for seemingly abstract concepts in the social sciences. Pick a social science variable (e.g., aggression, love, happiness) and operationalize it for a hypothetical study