In Neo4j to create relationship between nodes you have to use the CREATE statement like we used to create nodes. lets create relation between two already created nodes.
Example:

• Already created nodes:
• Query to create relation:

  $ MATCH (a:GeeksforGeeks), (b:W3School)
  WHERE a.Name = "A Computer Science Portal" AND b.Name = "We are the Learner"
  CREATE (a)-[r:edutech]->(b)
  RETURN r

• Output of above query:
  

  To create multiple relationship between nodes:
  You can see how easy it is to continue creating more nodes and relationships between them. So we will create one more node and add two more relationships.

• Creating a new node:

  $ CREATE (c:Company { Name: "Tuitorial" })

  Output:
  

• Creating relationship:

  MATCH (a:GeeksforGeeks), (b:W3School), (c:Comapny)
  WHERE a.Tag = "A Computer Science Portal" AND b.Tag = "We are the Learner" AND 
  c.Name = "Tuitorial" CREATE (c)-[pr:PRODUCED]->(b), (c)-[pr1:PROVIDER]->(a)
  RETURN a, b, c

  Output:
  

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