How to set up development environment in salesforce

Guide

1. Go to Setup in the top right corner.

2. Find Sandboxes by searching in the Quick Find box (Type "Sandboxes" and select it.)

3. Click New Sandbox.

4. Assign a name to your Sandbox.

5. Choose Developer Sandbox, which is ideal for testing code changes and customizations.

6. You can leave Apex Class empty. And define the access level.

7. Hit Create.

8. It may take some time (minutes to hours) for the sandbox to become available.