A copywriter/planner is a very important position that requires extensive knowledge and skills. For details, you can refer to the following books: Brand Management by Michael Porter: This book is a classic in the field of brand management. It covers the theory and practice of brand building, communication, competition, etc. It is very useful for copywriters/strategists. 2. Marketing Management by Stephen Sherry: This book covers the basic concepts, principles, and strategies of marketing management, including market research, competitive analysis, pricing strategies, promotion strategies, etc. It is very useful for copywriters/strategists. 3 Advertising-David Ogilvy: This is a classic book on advertising that covers the history, principles, strategies, creativity, and other aspects of advertising theory and practice. It is very useful for copywriters/strategists. 4 Internet Marketing by Michael Hofstadter: This book covers the basic concepts, principles, strategies, and practices of online marketing, including search engine marketing, social media marketing, email marketing, and other aspects of theory and practice. It is very useful for copywriters/strategists. 5 The $100000 Book: And How to Make It In Your First Year As a Planner: This is a classic book on marketing management that covers the basic concepts, principles, and strategies of marketing management, including market research, competitive analysis, pricing strategies, promotion strategies, etc. It is suitable for copywriters/strategists.