A shortcode has 4 components:
cm identifier. This does not change for any shortcodes you want to use for this plugin.
table attribute. This identifies the spreadsheet from the main plugin settings menu that you want to pull the value from. Table IDs are a number and found directly above the Spreadsheet URL field in the settings menu.
row attribute. This identifies the row number in your spreadsheet that you want to pull the value from.
column attribute. This identifies the column name in your spreadsheet that you want to pull the value from. Column names should be the value in row 1 of your spreadsheet.
Below is an example of how the full shortcode looks in your WordPress editor.
And how that shortcode displays a value on the post.
The sheet.codes plugin also supports rich links in spreadsheet cells. To get those links to display properly on your site, simply add a type=link attribute to your shortcode.
Plugin shortcodes can be used in several WordPress fields, you can see a full list here.