Fresh installation, how to set up the application

Set up the DHIS2 application on an Ubuntu server.
When i check users i get this error

“here was an error loading the current user
Server connection failed for API request: GET http://dhis2.health.gov.sc/api/38/users/M5zQapPyTZI?fields=organisationUnits[id%2Cpath%2CdisplayName%2Cchildren%3A%3AisNotEmpty]%2CdataViewOrganisationUnits[id%2Cpath%2CdisplayName%2Cchildren%3A%3AisNotEmpty]%2CteiSearchOrganisationUnits[id%2Cpath%2CdisplayName%2Cchildren%3A%3AisNotEmpty]

Kindly share a full documentation manual on how to get started with DHIS2

Please have a look: Installation - DHIS2 Documentation