Open.School is a search engine for learning through courses. We have our own curated set of courses and we keep them in our own index for fast and accurate retrieval. Most courses are online courses but some courses have lecture notes and slides available, which we also select and crawl. We use natural language processing and information retrieval principles for fast, secure and precise search. We also keep MOOCs in our index, which are sometimes free courses. We also curate online degrees, like bachelor and master degrees. PhD degrees are difficult to find online, but there are a few options that you may find in your field. We sometimes keep tutorials and articles in our index for the benefit of our users, especially when formal courses on those topics are not easily available. There is also an option to summarize a course in the search results, if there is some interest in knowing more about it. For summarization, we use LLMs like GPT from OpenAI. Our LLM service is free for all and the user may also ask a question not related to courses to the LLM. Our search engine has a natural language interface for convenience. Queries like "data science courses" or "history online" or "geometric deep learning" are all valid queries. If you cannot find a course to your liking or if the method of delivery is not suitable, you can add "online" or "open" to your query to search only for online courses.