A structured period of instruction or practice, typically taking place at a set time, focusing on personal guidance in a specific skill or subject, such as music or language acquisition.

A segment of educational material divided into chapters or units, often used in the context of textbooks or language studies, designed to facilitate learning by presenting information in manageable portions.

An organized class or session aimed at providing training or education, where the emphasis is on active participation and hands-on learning rather than passive observation.