Let's see, for example, if you want people to read more, you should have "latest posts" widgets; if you want to encourage discussion in the forum, you should have "featured topics" widgets; and if you want to showcase the forum's identity, you should choose "about" or "about" widgets. These are the typical widgets that every good forum should use. Remember to evaluate the purpose of each widget; each one should have a reason and a logical place in the forum. Otherwise, it will just be "noise" and will clutter the forum, causing you to lose users.
