This e-portfolio assignment for the COIT20250 E-Business Systems course comprehensively explores various facets of e-commerce. It commences with an overview of establishing an e-commerce presence, detailing essential steps like platform selection, merchant account setup, and marketing strategies. The portfolio then delves into the crucial aspects of e-commerce security and payment systems, emphasizing the importance of secure transactions and addressing potential threats such as fraud. Furthermore, it outlines various e-commerce business strategies, including customer-centric approaches, website optimization, and the significance of clear product descriptions. The assignment also examines e-commerce marketing and advertising techniques, highlighting SEO, email marketing, and market affiliation. It then investigates social, mobile, and local marketing, emphasizing the importance of social media strategies, mobile marketing, and local community engagement. Finally, the e-portfolio concludes with a discussion on e-commerce retailing and services, covering e-tailing, distribution channels, branding, and the significance of customer feedback and strong distribution networks for successful online businesses. Each topic is supported by relevant academic and general references, visual aids, and multimedia applications to enhance understanding.