Creating a Post Group is super easy and fast. It can be done within a minute. A-Z guidance has been described here for the first time or new user.
After installing and activating the plugin, go to any page or post in block editor mode.

1 Click on the Add block.
2 Now, search with post group.
3 and once get the group, click on it.

Now just click on Publish, and it’s done.