How to use the packages related to data in octave?

I have Octave with database, dataframe, data-smoothing installed.

I want to know how can I use them for knowing any function’s usability. What are the purposes of the installations of these packages in octave?

packages.octave.org provides the full list of packages with their brief descriptions and links to full descriptions. If any aren’t included in your Windows MXE Octave installation, you can install them with pkg install -forge.