It seems like you're looking for information on AI (Artificial Intelligence) in PDF format、There are numerous resources available online that cover various aspects of AI, from introductory concepts to advanced topics、Here are a few suggestions on where and what to look for:

1、Online Learning Platforms: Websites like Coursera, edX, and Udemy often provide course materials in PDF format、Look for courses on AI fundamentals, machine learning, deep learning, etc.

2、University Websites: Many universities offer free course materials online、MIT OpenCourseWare, for example, has a wealth of resources on AI and related fields.

3、Research Papers: Websites like arXiv.org provide access to a vast collection of research papers on AI、These can be more technical but are invaluable for understanding the latest developments in the field.

4、Books: Some books on AI have previews or excerpts available online in PDF format、Websites like Google Books often allow you to preview parts of books.

5、Specialized Websites: Websites dedicated to AI, such as AI Shack or Towards Data Science, might have downloadable guides or tutorials.

When searching, use specific keywords like AI basics PDF, machine learning guide PDF, or deep learning tutorial PDF to find materials that suit your needs.