This document defines and categorizes different types of resources. It discusses natural resources, which come directly from nature and can be renewable like plants or non-renewable like coal. Natural resources are further broken down based on whether they are currently available or potential, as well as biotic versus abiotic. The document also defines human-made resources as natural substances that have been modified through human technology or effort. Finally, it discusses human resources as the skills and education that allow humans to create additional resources, and the importance of conserving resources through sustainable development.