Part 8 answers: What do I do when nothing works?
Every beginner meets the same failures: a cryptic tool message, a test that fails for no clear reason, a build that passes on one machine and fails on another. This part collects eight real failures into one troubleshooting table so a symptom points to its likely cause.
It then teaches three habits that get you unstuck: reproduce with the smallest case, read the first error, and bisect with Git.
What | Detail |
|---|---|
Time | About 1 hour. Skim it now; open it the first time something fails. |
You will build | Nothing new: a habit of reading the first error and shrinking the failure. |
You are done when | You can name the stage that failed from the first message and find its row in the table. |
Match a symptom to its likely cause using the troubleshooting table.
Shrink a failing case to the smallest reproduction before changing code.
Check a repository against the beginner mistakes checklist before asking for help.
# | Lesson | What it covers | Level |
|---|---|---|---|
8.1 | Symptom, cause, check and fix, with real output. | F | |
8.2 | Shrink the failure, find the first bad commit. | F | |
8.3 | Eighteen common mistakes, each pointing back to its lesson (optional). | F |
Lessons are in learning order: each one sets up the problem the next one solves. The glossary and the command cheat sheet are open to you throughout; if something fails, go to the troubleshooting table.
This course stays on the front-end start-up path and links out instead of repeating. These lessons build on or continue what this part teaches.