Reply To: tabs in para. style

That option in the Paragraph Styles is for the Tab Stops. It means you can assign your tabs to stop at a particular location. For example you want a tabular layout for your accounting data each tab at a specific distance:
1st tab at 2 inches
2nd tab at 3 inches
3rd tab at 5 inches
4th tab at 5.5 inches
and so on…

In this way you can create a style for your tabs’ stops. So when you apply your paragraph style and insert a manual tab in your text frame, the tab will automatically move to your prescribed location.

https://blogs.adobe.com/indesignpost/2011/06/quick-tip-indesign-working-with-tabs/

To know more about Tabs, I suggest watching some tutorials on Lynda.com, like this one:
https://www.lynda.com/Illustrator-tutorials/Working-tabs/161817/177378-4.html