# Collections — Astro

Source: https://www.geekswithgeeks.com/en/astro/astro-11

> Use Collections as part of Astro.

## The essential idea

**Collections** is a practical part of Astro. Start with the problem, then identify the input, transformation, and expected result.

## Try a focused example

Change one value, run the example, and compare the result to your prediction.

```bash
value=0
echo "$value"
```

Output:

```
0
```

## Common pitfall

Do not learn **Collections** by copying. Use a small experiment and feedback to check your explanation.

Quick check

**Quiz:** What is good practice for Collections?

- [x] Run one small example.
- [ ] Memorize without testing.
- [ ] Ignore feedback.

*Answer:* Run one small example.. Focused experiments reveal cause and effect.