AI coding assistants: GitHub Copilot and OpenAI Codex

What you will be able to do

Skills you add to your Herizon profile when you finish: GitHub Copilot, Codex, AI-assisted Development.

• A clear picture of what Copilot and Codex are and what each plan includes
• One feature built with an assistant, on a branch, with a pull request
• A self-review checklist you can reuse on any AI-written code
• The privacy settings to check before you paste code into an assistant
• A way to tell when a tutorial about these tools is out of date

Who it is for

Time per page: 15 to 30 minutes Whole course: 4 to 5 hours (11 pages, at your own speed) This is for you if you are: - Learning to code and want to use an assistant without losing your own skills - A jobseeker who wants a real project and a pull request to show - Changing career into a role where teams use these tools every day You need the basics of Git and a small project on GitHub. If branches and pull requests are new, take the Git & GitHub course first. For another coding assistant, see Getting started with Cursor and Getting started with Claude Code. ---

The situation you work through

Aino, a career switcher in Espoo, builds a small portfolio app: she uses GitHub Copilot in VS Code for small edits and OpenAI Codex for one bigger task, a skill filter with tests, and reviews every change before it is merged.

Your practice task

Ship one small feature on a project you have on GitHub with an AI coding assistant, Copilot or Codex. Work on a branch, run the tests and add at least one new test, read the whole diff, and open a pull request with a self-review checklist in the description. Submit the pull request link, your first prompt word for word, your checklist, and three sentences on what the feature does, what you corrected in the assistant's work and what you would do differently, plus a short note on the plan you used and the usage you saw.

What is inside

1. Two assistants, one project
2. Copilot plans and AI credits
3. Copilot in VS Code
4. Copilot beyond the editor
5. Your code and your data
6. Codex plans and install

and 5 more pages

Finish with a short quiz to earn your certificate.