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# 01 · Hello, Apex: your first class
- URL: https://www.namastesalesforce.com/courses/apex-beginners/hello-apex-your-first-class/
- Published: 2025-05-22T09:00:00.000Z
- Updated: 2025-05-22T09:00:00.000Z
- Description: Open the Developer Console, write ten lines, run them anonymously — and understand every one of them.
- Author: Swarnil Singhai
- Tags: Apex for Absolute Beginners, #lesson, #duration-20m, #Import 2026-09-03 19:13

Open the Developer Console, write ten lines, run them anonymously — and understand every one of them.

## Where Apex runs

Apex executes on Salesforce's servers, inside a transaction, under limits. That one sentence explains most of what makes it different from JavaScript or Python.

## Execute Anonymous is your REPL

The Developer Console's Execute Anonymous window runs any block instantly. It is how you will test every idea in this course before committing it to a class.

## Practice in your org

- Open your Developer Edition org and follow along step by step
- Change one thing at a time and note what happens
- When something breaks, read the error before searching for it