Two-part series on Graph Databases by Rajendra Gupta at MSSQLTips
SQL Server 2017 Graph Database Example
SQL Server 2017 Graph Database Query Examples (part 2, also by Rajendra Gupta)
Robert Sheldon’s series on Graph Databases at Simple Talk (Redgate Hub)
SQL Server Graph Databases – Part 1: Introduction
SQL Server Graph Databases – Part 2: Querying Data in a Graph Database
SQL Server Graph Databases – Part 3: Modifying Data in a Graph Database
SQL Server Graph Databases – Part 4: Working with hierarchical data in a graph database
SQL Server Graph Databases – Part 5: Importing Relational Data into a Graph Database
Free ebook, Graph Databases by Ian Robinson, Jim Webber and Emil Eifrem
Power BI – Graph visuals
Power BI – Force-Directed Graph
Power BI – Advanced Graph Visual by ZoomCharts
They have a commercial version of the visual as well.