We use analytics cookies.We use cookies to analyze site traffic and improve your experience.
Loading...
System Design Masterclass · Devops Cicd
Free preview: the first 2 parts of this 7-part lesson.
Already bought the course? Sign in to read the whole lesson.
this lesson is part of
System Design Masterclass
Unlock this lesson and the 751 other paid lessons
$25 once, by PayPal
See the System Design courseread the rest of this lesson in
System Design Masterclass
Unlock this lesson and the 751 other paid lessons
$25 once, by PayPal
See the System Design coursein Devops Cicd
This lesson is part of the full System Design Masterclass. Unlock it along with 769 other lessons for a one-time payment.
One-time payment by card or PayPal
Get Lifetime AccessOne-time payment: UPI, card or netbanking
Get Lifetime Access18 Foundation lessons are free, no payment needed. Try them now
It is easy and good
“It is really nice and good Please join the course”
A team of five developers worked on the same codebase stored on a shared network drive. One Tuesday, two developers edited the same file simultaneously. Developer A saved their changes. Developer B saved 10 minutes later, overwriting everything Developer A had done. Nobody noticed until Friday, when the missing code caused a production incident.
Before version control, this was normal. Teams emailed zip files of code, named folders project_v2_final_FINAL_reallyfinal, and prayed that nobody edited the same file at the same time.
Version control systems track every change to every file, who made it, when, and why. They let multiple developers work on the same codebase simultaneously without overwriting each other's work. They let you roll back to any previous state. They make collaboration not just possible but safe.
Git is the dominant version control system today, used by 95%+ of development teams. Understanding it isn't optional. It's the first tool you set up on any project and the last one you'd give up.
| Concept | What It Is |
|---|---|
| Repository | A directory tracked by Git, containing all files and their complete history |
| Commit | A snapshot of all tracked files at a point in time, with a message describing what changed |
| Branch | A parallel line of development, work on a feature without affecting the main code |
| Merge | Combining changes from one branch into another |
| Remote | A copy of the repository on a server (GitHub, GitLab, Bitbucket) |
| Pull Request | A proposal to merge changes, enabling code review before integration |
The mental model: a Git repository is a timeline of snapshots. Each commit is a snapshot. Branches let you create parallel timelines. Merging combines timelines back together.
Distributed version control. Every developer has a complete copy of the repository, including its full history. You can commit, branch, and view history without network access. This is what makes Git "distributed." Unlike centralized systems (SVN), there's no single server that everything depends on.