I watched the MIT 6.006 Introduction to Algorithms course (0) while studying leetcode a couple years ago. I’d watch the lecture, take notes, and then find some related leetcode questions and solve them. I found it considerably beneficial to do the two in tandem and made some pretty significant progress with my understanding of data structures and algorithms. Hope this helps.

[0] https://youtube.com/playlist?list=PLUl4u3cNGP61Oq3tWYp6V_F-5...