This book deals with what every Muslim must learn about matters of his religion. He mentioned important issues in the field of belief, and the corruption that may befall it if a Muslim is ignorant of its contents, and what it requires of taking caution and being cautious about what contradicts it. He also spoke about the importance of following the Messenger - may God bless him and grant him peace - in everything that a Muslim does in the field of worship and transactions. It is of great importance to everyone who wants to know Islam briefly and correctly.