The book content is aligned with the ISTQB Test Analyst syllabus, whose newest version, 4.0, was published in May 2025. It provides professional testers with state-of-the-practice knowledge that is applicable in all industries. The topics selected are based on scientific evidence of their effectiveness. As far as we are concerned, due to the recent release of a new version of the syllabus, currently, there are no books on the market that cover the content of this syllabus. ISTQB (International Software Testing Qualifications Board, www.istqb.org) is an international, non-profit organization that maintains the leading global certification scheme in the field of software testing. The ISTQB scheme is recognized as one of the most reputable and widely accepted certification programs in the software testing industry. Over the past 20 years, more than 1.4 million ISTQB exams have been conducted in over 130 countries, resulting in the issuance of over 1 million certificates. This underscores the popularity of ISTQB certifications and the overwhelming interest in formalized training and education in the field. Among them, the ISTQB Test Analyst certification accounted for over 4,000 exams in 2024. Thanks to the growing adoption of the certification program globally, the proposed book would cater to a large and eager audience.