When I was beginner in using Redux to manage state in JavaScript while using React, I often dispatched unnecessary amount of actions when I could be done with just one or two. Or when I was loading initial data when user visits website, I often dispatched an action that set only specific resource. Something like this:

const fetchAppData = () => dispatch => apiClient.fetchAppData()
    .then(res => res.json())
    .then(res => {
        if (res.error) {
            dispatch(actions.showNotification(res, false))
            return
        }
        dispatch(actions.setUser(res.users)) // action type is SET_USER
        dispatch(actions.setPosts(res.posts)) // action type is SET_POSTS
    })

I eventually figured it out Redux store can handle one action in multiple reducers at the same time so the two dispatch lines became one dispatch(actions.setAppData(res)). Action type is SET_APP_DATA and is defined as case in both reducers as opposed to SET_USER which is defined only in users reducer and SET_POSTS only in posts reducer.

Another use case when you can reduce amount of dispatched actions is when you set a data and at the same time you want to display a notification. Following the previous example we could have another reducer for notifications that sets state of notification to {type:'SUCCESS', message: 'Data loaded'} when SET_APP_DATA is dispatched.