How-toVersion ControlDoneStarted
Undo the last Git commit: reset, revert and restore
Three ways to take back work in Git, and the one question that picks between them: has the commit already been shared?
Learning pathBeginner
Git, tests and delivery
The everyday safety net of a software project: undo mistakes in Git, get out of the three common Git problems, write tests with pytest and run them on every pull request.
- 4lessons
- ~43 minin total
- Beginnerlevel
- 3topics
Outcomes
What you will be able to do
Three ways to take back work in Git, and the one question that picks between them: has the commit already been shared?
The three messages that stop most people: what 'detached HEAD', 'fetch first' and 'CONFLICT' mean, and the exact commands that get you out of each.
Test a small function, run the tests, read a failure, and cover many cases with one parametrized test. Install pytest, write six lines, run one command.
One YAML file turns your test suite into a check that runs on every push and pull request, on several Python versions, with dependency caching.
Covered
Topics and formats in this path
- Version Control
- Unit Testing
- CI/CD
- How-to
- Troubleshooting
- Tutorial
Learning plan
4 lessons, in order
Each lesson is short enough for one sitting and ends by pointing to the next.
- How-to
TroubleshootingVersion ControlDoneStarted
Git troubleshooting: detached HEAD, rejected pushes and merge conflicts
The three messages that stop most people: what 'detached HEAD', 'fetch first' and 'CONFLICT' mean, and the exact commands that get you out of each.
How-toUnit TestingDoneStarted
Write your first unit test with pytest
Test a small function, run the tests, read a failure, and cover many cases with one parametrized test. Install pytest, write six lines, run one command.
TutorialCI/CDDoneStarted
Run your tests on every pull request with GitHub Actions
One YAML file turns your test suite into a check that runs on every push and pull request, on several Python versions, with dependency caching.
Questions
Before you start
Who is this for?
The everyday safety net of a software project: undo mistakes in Git, get out of the three common Git problems, write tests with pytest and run them on every pull request. It is written for beginner readers.
How long does it take?
About 43 minutes of reading and doing across 4 lessons. Each lesson shows its own time, so you can do one at a sitting.
Do I need an account?
No. Everything here is free to read. An account is only needed to ask or answer a question in the community.
What if I get stuck on a lesson?
Ask in the community: say which lesson, what you tried and what happened. Every lesson also shows when it was last verified.
Ready when you are
Open the first lesson now: nothing to install, nothing to sign up for.