Trailhead is a resource that the consultant can recommend for training users to learn basic Salesforce functionality at their own pace and track lesson completion. Trailhead is an online learning platform that provides interactive and gamified content on various Salesforce topics, such as products, features, skills, and best practices. Trailhead also allows users to earn badges and points as they complete modules and projects, and track their progress and achievements. Trailhead is free and accessible to anyone who wants to learn Salesforce. Power of Us Hub, Trailblazer Community, and Salesforce Einstein are not resources that provide training on basic Salesforce functionality. Reference:
https://trailhead.salesforce.com/en/home
https://trailhead.salesforce.com/en/content/learn/modules/trailhead_basics