Hello and welcome to the forum!
Great to have you here.
To load a csv (which you can export from Excel)
you can use: loadTable() \ Language (API) \ Processing 3+
Check out the reference for Table Table \ Language (API) \ Processing 3+
Now you have your data in suitable table in processing.
Now you can start working with it in a creative way.
It depends what those data are. For example when it’s the changing population of cities over time you can show the cities as circles with changing radius (reflecting the changing population).
To get more help, please describe the content of your csv and show its first 10 lines.
Warm regards,
Chrisir