I’m currently finishing a CS degree, so I’ve had some DSA courses. Nonetheless, I don’t feel I have good enough theoretical foundations or proficiency when putting them into practice.

My main goal would be to prepare myself for coding interviews, but I’d also want to make sure I understand well theory.

What are the best resources for learning Data Structures and Algorithms theoretical with good theoretical background that also allows you to succeed in coding interviews?

Some resources I’ve found, but I haven’t followed myself:

Free resources

Paid resources