If you are new to neo4j it may be (much) easier to begin with Neo4j Desktop
if you need to run command line neo4j server you will want to become familiar with Java, and check that you have a compatible java version installed and setup correctly...
Here is what I see on my Mac (Catalina),
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)
If I recall correctly I've run neo4j server on this Mac some time ago, lately I only run Neo4j desktop here (neo4j desktop includes the ability to spin up local neo4j dbs), and my neo4j servers are running in docker on ubuntu (bionic beaver).