Which item is not categorized as a "How-To Guide" found in the Marketing Resources tab?

The item that is not categorized as a "How-To Guide" found in the Marketing Resources tab is the Social Media Checklist. A "How-To Guide" typically provides step-by-step instructions or comprehensive strategies on how to perform specific marketing tasks or tackle specific challenges.

The Event Planning Checklist, Email Marketing Guide, and Website Optimization Guide all fit neatly into this category as they are designed to instruct users on best practices and actionable steps to achieve effective event marketing and engagement.

On the other hand, a checklist, such as the Social Media Checklist, serves as a list of key items to consider or tasks to complete but does not necessarily provide the in-depth guidance or instructional content that is characteristic of a How-To Guide. This distinction is crucial for understanding the categorizations within the Marketing Resources tab.