Model to predict coronavirus (covid19) spread
For a beginner, I would say the SIR model is a great place to start: 

https://idmod.org/docs/general/model-sir.html

Numberphile did a great video on using SIR to predict Covid-19:

https://www.youtube.com/watch?v=k6nLfCbAzgo

Hopefully this can get you started on your journey!