--- title: Fundamentals | TestFit Knowledge Base description: Before digging into specific typologies, learn the next level shared functionality. --- [Skip to content](https://support.testfit.io/knowledge/fundamentals#main-content) [![](https://support.testfit.io/hs-fs/hubfs/primary%20wordmark.png?width=150&height=113&name=primary%20wordmark.png)](https://testfit.io/) Open main navigation Close main navigation - - [Contact us](https://support.testfit.io/knowledge/kb-tickets/new) [Contact us](https://support.testfit.io/knowledge/kb-tickets/new) Welcome to the TestFit Knowledge Base - There are no suggestions because the search field is empty. 1. [TestFit Knowledge Base](https://support.testfit.io/knowledge) 2. [Fundamentals](https://support.testfit.io/knowledge/fundamentals) # Fundamentals Before digging into specific typologies, learn the next level shared functionality. ## Regions - [What are Regions?](https://support.testfit.io/knowledge/what-are-regions) - [What's the Difference Between a Fill and Free Region?](https://support.testfit.io/knowledge/whats-the-difference-between-a-fill-and-free-region) - [How do I Add a  Free Region to a Site?](https://support.testfit.io/knowledge/how-do-i-add-a-region-to-my-site) - [How Do I Apply/Change a Regions Preset?](https://support.testfit.io/knowledge/change-a-regions-preset) - [How Do I Reorganize & Rename My Regions?](https://support.testfit.io/knowledge/renaming-regions) - [How Do I Resize/Move a Free Region?](https://support.testfit.io/knowledge/resizing-a-region) - [Can I Add a Free Region to a Specific Level?](https://support.testfit.io/knowledge/adding-a-region-to-a-specific-level) - [How Do I Add a Fill Region?](https://support.testfit.io/knowledge/dependent-fill-regions) See less ▼ ## Key Functions - [Adding Spaces with a "Path Offset"](https://support.testfit.io/knowledge/adding-spaces-with-a-path-offset) - [Can I Copy/Paste Sites, Spaces, Layers,  and/or Regions?](https://support.testfit.io/knowledge/can-i-copy/paste-sites-spaces-layers-regions) - [Can I Group the Layers of My Site?](https://support.testfit.io/knowledge/layer-grouping) - [How Do I Stop my Site from Updating around New Objects or Modifications?](https://support.testfit.io/knowledge/pin-building) - [Can I Link Identical Layers in my Site?](https://support.testfit.io/knowledge/can-i-link-identical-layers-in-my-site) - [How Do I Add a Space to a Site? (Building/Warehouse/Park/Chalet/Impervious Area)  ](https://support.testfit.io/knowledge/how-do-i-add-a-space-to-a-site-building/park/chalet/impervious-area-) See less ▼ ## Roads - [Roads and Intersections](https://support.testfit.io/knowledge/roads) - [Getting Started](https://support.testfit.io/knowledge/getting-started#main-content) - [Interface](https://support.testfit.io/knowledge/getting-started#interface) - [Setting up a Deal](https://support.testfit.io/knowledge/getting-started#setting-up-a-deal) - [Site Design & Configuration](https://support.testfit.io/knowledge/getting-started#site-design-configuration) - [Fundamentals](https://support.testfit.io/knowledge/fundamentals#main-content) - [Regions](https://support.testfit.io/knowledge/fundamentals#regions) - [Key Functions](https://support.testfit.io/knowledge/fundamentals#key-functions) - [Roads](https://support.testfit.io/knowledge/fundamentals#roads) - [Site Development](https://support.testfit.io/knowledge/site-development#main-content) - [Mass-Based](https://support.testfit.io/knowledge/site-development#mass-based) - [Housing - High Density & Gurban](https://support.testfit.io/knowledge/site-development#housing-high-density-gurban) - [Housing - Low Density & Subdivision](https://support.testfit.io/knowledge/site-development#housing-low-density-subdivision) - [Housing - Garden](https://support.testfit.io/knowledge/site-development#housing-garden) - [Industrial](https://support.testfit.io/knowledge/site-development#industrial) - [Datacenters](https://support.testfit.io/knowledge/site-development#datacenters) - [Generative Design](https://support.testfit.io/knowledge/site-development#generative-design) - [Parking](https://support.testfit.io/knowledge/site-development#parking) - [Retail](https://support.testfit.io/knowledge/site-development#retail) - [Core-Based](https://support.testfit.io/knowledge/site-development#core-based) - [Web App](https://support.testfit.io/knowledge/web-app#main-content) - [Deal Pipeline & Asset Management](https://support.testfit.io/knowledge/web-app#deal-pipeline-asset-management) - [Deal Actions & Edits](https://support.testfit.io/knowledge/web-app#deal-actions-edits) - [Reports](https://support.testfit.io/knowledge/web-app#reports) - [Quantities & Costs](https://support.testfit.io/knowledge/web-app#quantities-costs) - [Pro Forma](https://support.testfit.io/knowledge/web-app#pro-forma) - [MCP](https://support.testfit.io/knowledge/mcp) - [Reports & Exporting](https://support.testfit.io/knowledge/reports-exporting#main-content) - [PDF Exports](https://support.testfit.io/knowledge/reports-exporting#pdf-exports) - [SketchUp Export](https://support.testfit.io/knowledge/reports-exporting#sketchup-export) - [TestFit to Revit](https://support.testfit.io/knowledge/reports-exporting#testfit-to-revit) - [Account Management](https://support.testfit.io/knowledge/account-management#main-content) - [Administration](https://support.testfit.io/knowledge/account-management#administration) - [Account](https://support.testfit.io/knowledge/account-management#account) - [Latest Release](https://support.testfit.io/knowledge/latest-release#main-content) - [2026](https://support.testfit.io/knowledge/latest-release#2026) - [2025](https://support.testfit.io/knowledge/latest-release#2025) - [2024](https://support.testfit.io/knowledge/latest-release#2024) - [2023](https://support.testfit.io/knowledge/latest-release#2023) - [2022](https://support.testfit.io/knowledge/latest-release#2022) - [Beta](https://support.testfit.io/knowledge/latest-release#beta) - [FAQ](https://support.testfit.io/knowledge/faq) - [Troubleshooting](https://support.testfit.io/knowledge/troubleshooting#main-content) - [Issues](https://support.testfit.io/knowledge/troubleshooting#issues) - [Errors](https://support.testfit.io/knowledge/troubleshooting#errors) [![Chill listening crop-3](https://support.testfit.io/hs-fs/hubfs/primary%20wordmark.png?width=124&height=40&name=primary%20wordmark.png "Chill listening crop-3")](http://testfit.io) Copyright © 2025, TestFit