This can be answered by checking out the documentation here:
https://docs.xperience.io/k11/developing-websites/loading-and-displaying-data-on-websites
While I could provide a very simple answer, it would then lead to 5-10 other questions. Your best bet is to check out the documentation and follow the instructions there to understand the basics of using the Portal Engine features (page type, page template, web parts, transformations)