I work as an ML/AI Engineer at a startup here. I'm currently using neo4j to study graph databases and use them to improve my skills at work!
when I start to know Neo4j I was impressed from the academy:
The program for learning is progressive and have a long-time support, you can see better in the certification program : https://neo4j.com/graphacademy/neo4j-certification/
When you participate in the neo4j ninja program you will have access to advanced cypher training and related libraries and technologies.