What language to use to grab data from an API (every x seconds) and how to live analyse it with an weboverlay?

So I want to as the questions says use an API (the Riot api) get the data, which I want to display.

I did use an api multiple times and with different languages but I dont know which one I should use for such purpose... I guess I should use an serversided language to get the data from the api (thinking about python) and then some JS to analyse it and create the webpage. Also I am not sure how to store the data, that I am able to adjust it every x seconds... Maybe a database? But this would lead to PHP regarding the website right?

I know the question is kind of odd but I don't know how to ask it differently...

(And sry for my english I am from germany)

Thx for all answers