Documentation in ISO 9001:2015 can be divided in two types: documents and records. Basically a record is a form that has been completed. There is some documentation that is mandatory, duch as the quality policy, or the scope of the QMS, and other that is optional, that is, the organization can decide to have it or not, such as the quality manual or procedures.
I recommend organizations to create at the beginning a procedure for document and record control, stablishing responsibilities, document owners, control of documents, codification , updates, etc. This way the documentation process will work smoothly during the implementation. This procedure is not mandatory but it is very helpful.