Can't bind to 'routerLink' since it isn't a known property

Source: https://stackoverflow.com/questions/42035387/cant-bind-to-routerlink-since-it-isnt-a-known-property

You need to add RouterModule to imports of every @NgModule() where components use any component or directive from (in this case routerLink and <router-outlet>.

declarations: [] is to make components, directives, pipes, known inside the current module.

exports: [] is to make components, directives, pipes, available to importing modules. What is added to declarations only is private to the module. exports makes them public.

See also https://angular.io/api/router/RouterModule#usage-notes