Retrieving data automatically from blog website

I’m trying to add notifications in my game that will update automatically when a new blog post is published. Is there a way to do this? I’m fairly new to web integration, so explain it to me like I’m a four-year-old. I don’t exactly need an entire script for this, just an explanation with examples. Thanks.

You may use a constant polling:

void Start() {
    StartCoroutine(StartBlogMonitoring());
}

IEnumerator StartBlogMonitoring() {
    while (true) {
        var rq = new WWW("http://myblog.com/blogposts-list");
        yield return rq;
        var list = Parse(rq.text);
        if (HasNewPost(list))
        {
            PushNotification();
        }
        yield return new WaitForSeconds(2);
    }
}

It will send a request to a blog site every 2 seconds to retrieve posts list, then check for a new post there and create notification. Instead of posts list, you can use whatever way is appropriate for your blog to check for new posts.