Ideal programming language

I am new to programming but I would like to create a web app. Basically, I would like to upload an excel file to that app that will use that file, do some calculation and prompt some forms that I will be able to download. I am thinking about a web app because I would like anybody else to be able to create a session and use the app. Which language should I use please? I attended 2 semesters of c++ and a data structures class. thank you for your help