Conditional programming in Shiny Web App

I wanted to create a simple App which has conditions like - If something(x) greater than something (y) then show (z) and so forth. It goes much deeper than that but if somebody can please help me create it would be great. I would love to talk about it over phone/email. Since I am new to Shiny Web Apps - I wanted to know what would be the best visualization for multiple elements which are linked with each other in conditions ?

Please help.

Master's Student
Purdue University (IN)
Industrial Engineering