The super-simple example above is of turning an Excel sheet into HTML to post an interactive spreadsheet on a website. [Change x and/or y to see the sum update.] It is easy to accomplish but must be done from Excel Online rather than the desktop version of Excel. Other ways to share include within an organization using additional Microsoft products such as Power BI (Business Intelligence.) This online method of sharing illustrated above can assist in creating a personal portfolio to demonstrate your skills. However, not all functionality available in the desktop version of Excel are available in the online version. For more information see this article on the differences between using a workbook in the browser and in (desktop version) of Excel.
How to create or open an online file in your browser. Check with UMASS/Isenberg IT.
Researching best way to regularly import data to Excel (esp Excel online)
Google sheets & charts
List of potentially useful tools - not an endorsement - I have not thoroughly reviewed these - just came across them and wanted to make a note to revisit.
https://whalewisdom.com/report/heat_map (hedge fund 13F filings - cold get the same directly from Edgar, but this might make it easier.) API functionality