Added day 38 tasks

Author: LondheShubham153

2026/day-38/README.md

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+# Day 38 – YAML Basics
+
+## Task
+Before writing a single CI/CD pipeline, you need to get comfortable with **YAML** — the language every pipeline is written in.
+
+You will:
+- Understand YAML syntax and rules
+- Write YAML files by hand
+- Validate them
+
+---
+
+## Expected Output
+- A markdown file: `day-38-yaml.md`
+- YAML files you create during the tasks
+
+---
+
+## Challenge Tasks
+
+### Task 1: Key-Value Pairs
+Create `person.yaml` that describes yourself with:
+- `name`
+- `role`
+- `experience_years`
+- `learning` (a boolean)
+
+**Verify:** Run `cat person.yaml` — does it look clean? No tabs?
+
+---
+
+### Task 2: Lists
+Add to `person.yaml`:
+- `tools` — a list of 5 DevOps tools you know or are learning
+- `hobbies` — a list using the inline format `[item1, item2]`
+
+Write in your notes: What are the two ways to write a list in YAML?
+
+---
+
+### Task 3: Nested Objects
+Create `server.yaml` that describes a server:
+- `server` with nested keys: `name`, `ip`, `port`
+- `database` with nested keys: `host`, `name`, `credentials` (nested further: `user`, `password`)
+
+**Verify:** Try adding a tab instead of spaces — what happens when you validate it?
+
+---
+
+### Task 4: Multi-line Strings
+In `server.yaml`, add a `startup_script` field using:
+1. The `|` block style (preserves newlines)
+2. The `>` fold style (folds into one line)
+
+Write in your notes: When would you use `|` vs `>`?
+
+---
+
+### Task 5: Validate Your YAML
+1. Install `yamllint` or use an online validator
+2. Validate both your YAML files
+3. Intentionally break the indentation — what error do you get?
+4. Fix it and validate again
+
+---
+
+### Task 6: Spot the Difference
+Read both blocks and write what's wrong with the second one:
+
+```yaml
+# Block 1 - correct
+name: devops
+tools:
+  - docker
+  - kubernetes
+```
+
+```yaml
+# Block 2 - broken
+name: devops
+tools:
+- docker
+  - kubernetes
+```
+
+---
+
+## Hints
+- YAML uses **spaces only** — never tabs
+- Indentation is everything — 2 spaces is standard
+- Strings don't need quotes unless they contain special characters (`:`, `#`, etc.)
+- `true`/`false` are booleans, `"true"` is a string
+- Validate online: yamllint.com
+
+---
+
+## Documentation
+Create `day-38-yaml.md` with:
+- Your YAML files
+- What you learned (3 key points)
+
+---
+
+## Submission
+1. Add your YAML files and `day-38-yaml.md` to `2026/day-38/`
+2. Commit and push to your fork
+
+---
+
+## Learn in Public
+Share your YAML "aha moment" on LinkedIn — the tab vs space mistake gets everyone.
+
+`#90DaysOfDevOps` `#DevOpsKaJosh` `#TrainWithShubham`
+
+Happy Learning!
+**TrainWithShubham**