Conceptual framework, theoretical framework, research gap and concept matrix: My Literature Review

It’s been a long time since I posted anything. With PhD, Supervisor, Husband and simply Life! I am totally packed. So, I have to conduct a literature review and I guess the heading says it all. How should I go about it? What’s the difference between conceptual and theoretical framework? How to find ‘the’ research gap? What is a concept matrix and how do you make one?