### 📘 `3_commit_existing_repo_gitlab_ubuntu.md`

```markdown
## 📘 `3_commit_existing_repo_gitlab_ubuntu.md`

### 📌 Purpose

Work with an existing GitLab repo: clone, edit, commit, and push using Ubuntu.

---

### 🛠️ Step-by-Step

#### Step 1: Clone the repository

```bash
git clone git@gitlab.com:your-username/your-repo.git
cd your-repo
````

---

#### Step 2: Edit files

```bash
nano myfile.txt
```

---

#### Step 3: Stage and commit

```bash
git add .
git commit -m "Your change description"
```

---

#### Step 4: Push your changes

```bash
git push origin master
```

If you use another branch (e.g., `main`, `dev`), substitute accordingly.

---

````

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