AI Foundations
Start here if you've never used ChatGPT or GPT-based tools seriously, this is OpenAI's own on-ramp, and it pairs well with Stanford's ChatGPT Edu access.
Agents and Workflows
Covers directing multi-step AI agents, most relevant once you're comfortable with prompting and want to automate a real workflow.
Applied AI Foundations
For once you're past basics and want to apply AI to recurring work tasks, the natural second step after AI Foundations.
OpenAI Academy: Higher education community
OpenAI's space for universities, with events and resources on ChatGPT Edu in teaching and campus work; needs an OpenAI Academy sign in.