What you are learning
Vaultgate is keeping credentials out of git while unlocking deploy workflows. The teaching focus is Secrets and environments (repository secrets, environment protection, variables).
Work in order. Early parts set vocabulary and environment; later parts assume the earlier checkpoints.
How to use these lessons
Read the goal, open the matching GitHub folder, complete the lab or exercises, then return for the explanation. If a command fails, check you are in the numbered folder first.
Parts in order
Each chapter below is one checkpoint in this track.