Where can I locate data for posted tutorial on the website so as to use it for practicing purpose. For example, I want to do hands on training on common GIS operations on this link https://community.safe.com/s/article/area-and-distance-measurements.

The training datasets are available for download here, under the heading "Sample data":

https://community.safe.com/s/article/fme-training-course-resources

You can find the downloadlinks of the files in the top right of the article:

These are Template Files (*.fmwt) where the data is added to the workspace, so you won't need anything else.

Thank you David for the downloaded links. It is appreciated.