This comprehensive guide, 'Explanation of Al-Waseet in Arabic Language,' is meticulously crafted by Professor Iyad Mansour for eleventh-grade students in the scientific stream. Published in 2017, this first part of the series serves as an essential academic resource. It systematically breaks down complex grammatical rules, rhetorical devices, and literary texts found in the Al-Waseet curriculum. The book provides clear explanations, numerous examples, and practical exercises to enhance students' understanding and mastery of the Arabic language, preparing them thoroughly for their examinations. It's an indispensable tool for achieving academic excellence.