Google has renamed this product so many times that it is worth spelling out. Dialogflow CX is now presented as Conversational Agents, part of what Google calls Customer Engagement Suite, and the documentation itself warns that some products and features are in the process of being renamed. The old Dialogflow CX console is listed as a deprecated interface, and generative playbooks and flows are being merged into a single console. Cloud Skills Boost has also been renamed Google Skills.
If you search for any of these you will find tutorials that no longer match the screen in front of you. This course, Create Conversational Agents with Stateful Flows, is the one I would start with. It is intermediate, takes about two hours, and covers the pieces that make a voice agent predictable: flows, pages, intents, entities and state handlers. You work in the actual console. If you already know the product you can jump to the challenge lab and still earn the skill badge.
It is also tied into Google's Gemini Enterprise Agent Ready programme. There is a wider learning path for contact centre engineers and architects that adds generative fallbacks, data store agents and integration with telephony, and I would do the architecture course from that path next. The weakness is the one I see in most vendor conversational AI training. It teaches you how to build in the tool, not how to decide what the agent should do. There is almost nothing on writing prompts and responses that callers understand, on escalation to a person, or on how containment rates get gamed when a team is judged on them. Those are the questions that decide whether a contact centre bot annoys customers. Search interest for Dialogflow tutorials is tiny, around 10 a month in the US, and falling, which I read as people searching for the new names rather than losing interest in the product. My take: take it if your employer is on Google Cloud, and do it soon, because the next rename is probably coming.
Pair it with a design-focused course so you learn why as well as how.