Content strategy can combine multiple disciplines.

• Writing and communication
• Information architecture
• User experience
• Front-end web development (HTML, CSS)
• Project management
• A tiny bit of marketing

If you want to learn more about content strategy, you should read about it and practice on your own.

Books

• Content Strategy for the Web
• The Elements of Content Strategy
• The Content Strategy Toolkit: Methods, Guidelines, and Templates for Getting Content Right
• Information Architecture, 4th Edition
• Everyday Information Architecture
• Learn to Code HTML and CSS: Develop and Style Websites
• UX Fundamentals for Non-UX Professionals: User Experience Principles for Managers, Writers, Designers, and Developers
• Institutionalization of UX: A Step-by-Step Guide to a User Experience Practice, Second Edition
• Effective Project Management: Traditional, Agile, Extreme, Sixth Edition
• Adaptive Project Framework: Managing Complexity in the Face of Uncertainty
• Cultivating Content Design
• Global Content Marketing: How to Create Great Content, Reach More Customers, and Build a Worldwide Marketing Strategy that Works