DSA Preparation Strategy with Roadmap

My coding interview preparation started during college days. But, I never find courage to apply in any product based company. As I was not confident enough whether I will be able to crack any product based company or not. But last year, while working in TCS, I started my preparation again, with a strategy and a plan. I was able to crack coding interviews of big product companies in a single go. But, what I did different this time? How I mastered DSA? How I gained enough confidence to clear coding interviews of product based companies? If you are also struggling to master DSA and need a structured roadmap and strategy to master Data structures and Algorithms then, reserve a slot now. If you want to know how I mastered DSA and cleared coding interviews of top product based companies.