My answer is going to be a bit different but this is what worked for me. I tried many courses, reading books, trying to code etc but never quite understood data structures. I used to get bored halfway.
What worked for me is literally solving problems. I would pickup a data structure. Implement it in Java on my own with help from internet. Then i would solve 10 problems on it. Then move to next data structure. Once you have familiarity with most used data structures like stack, queue, maps, linked lists, arrays, trees, etc. then it’s time to move to algorithms like graphs, better sorting techniques, etc.