Leaf types can be categorized based on their shape, structure, and arrangement. The two main categories are simple and compound leaves. A simple leaf has a single blade, while a compound leaf consists of multiple leaflets attached to a single stem. Additionally, leaves can be classified by their margins, such as smooth (entire), serrated (toothed), or lobed. The arrangement of leaves on a stem can also vary, with types including alternate, opposite, and whorled. Understanding these classifications helps in identifying different plant species, including those in the plant kingdom.