# LEGACY DOCUMENTATION

- [Adding Variables](/legacy-documentation/adding-variables.md): Variables give templates their superpowers. They tell Documint where to place your data in your document.
- [Display Rule](/legacy-documentation/display-rule.md): Show or hide elements in your document based on the data being merged. Former Conditional Logic.
- [Repeating Elements](/legacy-documentation/repeating-elements.md): Repeat an element (eg. Row, Column, etc.) for each item in a list of data.
- [Data and Variables](/legacy-documentation/data-and-variables.md): Variables give templates their superpowers. They tell Documint where to place your data in your document.
- [Data Types](/legacy-documentation/data-and-variables/data-types.md): Learn how to work with different data types in your templates.
- [Functions](/legacy-documentation/data-and-variables/functions.md): Functions allow you to manipulate data in your template
- [$calc](/legacy-documentation/data-and-variables/functions/calc.md): The $calc function is a powerful expression evaluator that enables complex calculations, string manipulations, array operations, and provides a secure sandbox environment within your templates.
- [Operators](/legacy-documentation/data-and-variables/operators.md)
- [How-To Videos](/legacy-documentation/how-to-videos.md): Troubleshooting and how-to videos for Documint features and functions
- [Formatting Variables](/legacy-documentation/how-to-videos/formatting-variables.md)
- [Airtable Integrations](/legacy-documentation/how-to-videos/airtable-integrations.md)
- [Airtable Data and Variables Videos](/legacy-documentation/how-to-videos/airtable-data-and-variables-videos.md)
- [How to add variable images from your Airtable attachments](/legacy-documentation/how-to-videos/how-to-add-variable-images-from-your-airtable-attachments.md)
- [How to filter items in your Documents](/legacy-documentation/how-to-videos/how-to-filter-items-in-your-documents.md)
- [How to group items in your Documents](/legacy-documentation/how-to-videos/how-to-group-items-in-your-documents.md)
- [Signing Documents with SignNow and Zapier](/legacy-documentation/how-to-videos/signing-documents-with-signnow-and-zapier.md)
- [Add charts to your Documents with QuickChart.io](/legacy-documentation/how-to-videos/add-charts-to-your-documents-with-quickchart.io.md)
- [Add a Word Cloud chart to your Documents with QuickChart.io](/legacy-documentation/how-to-videos/add-a-word-cloud-chart-to-your-documents-with-quickchart.io.md)
- [Using Make.com (Integromat) to create line items in your documents](/legacy-documentation/how-to-videos/using-make.com-integromat-to-create-line-items-in-your-documents.md)
- [How to QR codes to your documents with QuickChart.io](/legacy-documentation/how-to-videos/how-to-qr-codes-to-your-documents-with-quickchart.io.md)
- [How to add a progress chart to your documents with QuickChart.io](/legacy-documentation/how-to-videos/how-to-add-a-progress-chart-to-your-documents-with-quickchart.io.md)
- [How to connect your Documint account using API keys](/legacy-documentation/how-to-videos/how-to-connect-your-documint-account-using-api-keys.md)
- [How to connect your Documint account to Airtable using your Personal Access Token (PAT)](/legacy-documentation/how-to-videos/how-to-connect-your-documint-account-to-airtable-using-your-personal-access-token-pat.md)