Explain action name in a template

@belgoros wrote:

I wonder what is the difference between the following actions definitions:

1. When defined as <a {{action 'login'}}>Login</a>
2. When defined as {{#link-to ‘index’ }}Home{{/link-to}}

Is is correct to say that when using with {{#link-to 'index' }} helper, I should always define a route with the same name as the String passed in to link_to helper ?

3. Should actions be always declared in controllers only ?
4. What does the below declaration (onLogin) mean (in app/components/main-navigation.js):

actions: {
    login() {
      // Closure actions are not yet available in Ember 1.12
      // eslint-disable-next-line ember/closure-actions
      this.sendAction('onLogin');
    },

5. What does the onLogin='transitionToLoginRoute declaration mean (in app/templates/application.hbs):

{{main-navigation onLogin='transitionToLoginRoute'}}

There is no action onLogin defined anywhere. Is there any convention to explain this ? Thank you.

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