Doing digital marketing requires holistic planning and execution across multiple channels. Research and defining objectives are essential first steps. The objective should define the desired user action and how much will be paid for that action. Search is a foundational channel where quality score, keywords, and landing pages must align with search intent. Display reaches users across different contexts and using data segments. Mobile growth is substantial but challenges remain in technology and measurement. Ongoing testing, measurement against objectives, and optimization across channels are needed for effective digital marketing.