I was looking at graph databases/Neo4j a lot early last year and found Neo4j has a lot of good resources.

You can get this book for free through their website. [1]

This have some good documentation[2], including this page "Transition from relational to graph database".[3]

[1] https://neo4j.com/graph-databases-book/

[2] https://neo4j.com/docs/getting-started/current/

[3] https://neo4j.com/docs/getting-started/current/appendix/grap...