The "Spanish Grammar by Levels" is a comprehensive teaching resource based on the curriculum plan of the Instituto Cervantes, aimed at learners of Spanish as a second or foreign language. This book combines two approaches to grammar: the scientific, descriptive grammar and the didactic grammar specifically developed for teaching. It views grammar as a tool used by speakers and listeners to construct and interpret messages. The communicative nature of language is particularly emphasized in this work, focusing on the various linguistic forms and their functions. The numerous examples are drawn from corpora of Spanish and reflect the use of Spanish both in Spain and in Latin America. This comprehensive analysis of Spanish grammar is designed to support and enhance learners' language competence.