Ideally you would read the pages in the order listed in the left outline menu. However, here are some descriptions of the pages to get help get you more directly to the page you need.
Please note there are a couple of changes (columns) relating to the way facilities and laboratories are identified that are in review and hope to be released around the end of May, or early June 2018.
Getting Started with the OpenLDR
https://sites.google.com/site/openldr/getting-started-with-the-openldr
This web site is primarily intended for technical people and they often want to dig right in and know how to get started; so this page was included right at the beginning.
Design Principles
https://sites.google.com/site/openldr/design-principles
It's important to understand the approach behind the creation of the OpenLDR and not only the individual tables and fields. This page provides that general knowledge.
Data Tables
https://sites.google.com/site/openldr/data-model/data-tables
This page has a quick overview of the use of each of the tables that store the primary data. Pages under that page have the exact fields listings and descriptions of each column.
Dictionary Tables
https://sites.google.com/site/openldr/data-model/dictionary-tables
These are the more static tables with supporting information. It will also be helpful to read the page https://sites.google.com/site/openldr/design-documents/facilities-and-healthcareareas
Because it describes the intended usage of the Facilities and HealthcareAreas tables even if each implementation isn't utilizing them exactly the same.
In the Database Scripts page you will find two scripts that will create the OpenLDRData and OpenLDRDict scripts databases in a Microsoft SQL Server database server environment.
Understanding the actual data
Because a table name and column descriptions are only a start at understanding the actual "data" the following pages describe how the columns are used to structure the data.
This link is good because it describes the data in more of a conceptual structure and how it's imported which is also helpful in understanding the data in the OpenLDR.