This is the shortcode to add properties or articles by id
For properties, the shortcode works as described by the next screenshots.
Find the IDs of the properties you wish to list.
Add the properties IDs separated by comma and select the other shortcode options: how many listings per row, how many listings in total (total items must match total ids)
You can also select if you wish to list properties horizontally or vertically and optionally add a button with a link to more listings (a link of your choice)
For articles you can use the same options. Just select articles from this setting: