Concept notes and resources redirects you to pages with understanding of concepts in form of documents, videos or external links. Some external links may point to resources from other service providers. The objective is just to help students find good material easily.
Solved problems are a specially designed set of problems which are usually based on some concept learning code sheets and they do enrich your learning of concepts along. They also provide you confidence to solve real life problems. Solutions to these problems are visible on user's request with press of a button.