So for beginner/intermediate alg/data structures challenges with explanations and solutions I would recommend the following resources: 1. Read the Algorithm De

So for beginner/intermediate alg/data structures challenges with explanations and solutions I would recommend the following resources: 1. Read the Algorithm Design Manual. 2. Practice coding simple and then more advanced algorithms on sites like Coderbyte (aimed at beginners -> intermediate) and HackerRank (a bit more mathy). 3. Read as many algorithm explanations and code examples as you can on GeeksforGeeks. 4. Try and implement basic algorithms yourself like: shortest path, minimum spanning tree, DFS/BFS, tree traversals, different sorting algs, min/max heap, etc. and learn their running times. * Also this article may be helpful for you: https://medium.com/coderbyte/how-to-get-good-at-algorithms-data-structures-d33d5163353f https://medium.com/coderbyte/how-to-get-good-at-algorithms-d...