Don't find solution to connect 2 collections

Dear community

I try to create a link between 2 datasets and I’ve passed many time on online help pages which explain we have to link 2 dataset with “Reference” type field.

What I want to do : in an online encyclopedy I want to create a first page wich contain list of knowledge domain (Domain 1, 2, 3…). Those domains are contained in a collection which contain : (Icon for domain, domain name and domain description).
When user clieck in a domain in the list, he must open a dynamic page connected to another collection (domain, subdomain, subdomain description).

I’ve pased many hour about this problem and I don’t understand.

Collections are

  • Domainesdeconnaissance (contain ref domains)
  • encyclopedie (contain articles for all domain)

I don’t know how I can do…