fix links in preface

Author: ecormany

docs/flex-manual/docs/preface.md

@@ -12,25 +12,25 @@ Opentrons Flex is a complex system, so there are many different paths to learnin
 
 If you prefer a guided approach, this manual is structured so you can follow it from beginning to end.
 
-- **Learn about Flex.** The distinguishing features of Flex are listed in [Chapter 1: Introduction](introduction.md). The introduction also includes important safety and regulatory information.
+- **Learn about Flex.** The distinguishing features of Flex are listed in the [introduction](introduction.md). You should also review the important [safety and regulatory information](safety-regulatory.md).
 
-- **Get started with Flex.** If you need to set up your Flex, follow the detailed instructions in [Chapter 2: Installation and Relocation](installation-relocation.md). Then familiarize yourself with the components of Flex in [Chapter 3: System Description](system-description.md).
+- **Get started with Flex.** If you need to set up your Flex, follow the detailed [installation instructions](installation/index.md). Then familiarize yourself with the components of Flex in the [system description](system-description/index.md).
 
-- **Set up your deck.** Configuring the deck enables different scientific applications on Flex.  [Chapter 4: Modules](modules.md) describes Opentrons peripherals that you can install into or on top of the deck to perform specific scientific tasks. [Chapter 5: Labware](labware.md) explains how to work with equipment for holding liquids.
+- **Set up your deck.** Configuring the deck enables different scientific applications on Flex. [Modules](modules/index.md) are Opentrons peripherals that you can install into or on top of the deck to perform specific scientific tasks. Flex works with out of the box with a wide range of [labware](labware/index.md) for holding liquids.
 
-- **Run a protocol.** The core use of Flex is running standardized scientific procedures, known as protocols. [Chapter 6: Protocol Development](protocol-development.md) offers several ways to get ready-made protocols or design them yourself. To run your protocol, follow the instructions in [Chapter 7: Software and Operation](software-operation.md), which also has instructions for performing other tasks and customizing your robot's settings.
+- **Run a protocol.** The core use of Flex is running standardized scientific procedures, known as [protocols](protocols/index.md). Opentrons offers several ways to get ready-made protocols or design them yourself. To run your protocol, use the [touchscreen](touchscreen/index.md) or the [Opentrons App](opentrons-app.md). Both the touchscreen and app let you perform other tasks and customize your robot's settings.
 
-- **Keep Flex running.** Follow the advice in [Chapter 8: Maintenance and Service](maintenance-service.md) to keep your Flex clean and running optimally. Or sign up for one of the Opentrons services listed there and let us take care of Flex for you.
+- **Keep Flex running.** Follow the routine [cleaning and maintenance](maintenance/index.md) procedures to keep your Flex running optimally. Or sign up for one of the Opentrons services listed there and let us take care of Flex for you.
 
 - **Learn even more.** Still need something else? Consult the appendices.
 
-    - [Appendix A: Glossary](glossary.md) defines Flex-related terms.
+    - The [glossary](glossary.md) defines Flex-related terms.
 
-    - [Appendix B: Additional Documentation](additional-documentation.md) points you to even more resources for Opentrons products and writing code to control Flex.
+    - Read [additional documentation](additional-docs.md) for even more information about Opentrons products and writing code to control Flex.
 
-    - [Appendix C: Open-Source Software](open-source-software.md) explains how Opentrons software is hosted on GitHub as a resource for both developers and non-developers.
+    - Our [open-source software](open-source.md) is hosted on GitHub as a resource for both developers and non-developers.
 
-    - [Appendix D: Support and Contact Information](support-contact-information.md) lists how to get in touch with Opentrons if you need assistance beyond what our documentation provides.
+    - [Get in touch with Opentrons](support.md) if you need assistance beyond what our documentation provides.
 
 ## Notes and warnings