Salesforce Trailhead
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Salesforce Trailhead gamifies learning around CRM, sales operations, and marketing automation. The platform is free and uses game mechanics like badges and points to keep you motivated while learning Salesforce tools and marketing cloud fundamentals directly from the vendor.
It's perfect if you're already using or planning to adopt Salesforce in your role. The free cost and game structure make it engaging, though the content is narrowly focused on Salesforce's own ecosystem.