Ans. Selection control flow in Python is managed using conditional statements like `if`, `elif`, and `else`. These statements allow the program to execute certain blocks of code based on specific conditions. The flow of control is determined by evaluating boolean expressions, making it possible to implement decision-making logic in the program.

Ans. Nested loops are loops that are contained within another loop. In Python, you can place a loop inside the body of another loop, which allows for more complex iterations, such as iterating over multi-dimensional data structures. They are commonly used in tasks requiring the comparison of elements across multiple lists or matrices.

Ans. Common pitfalls when using loops in Python include infinite loops, which occur when the loop's exit condition is never met, and off-by-one errors, which happen when you miscount the iterations. Additionally, improper use of `break` and `continue` can lead to unexpected behavior and make the code harder to read. It's important to test loop conditions carefully and ensure they are logically sound.