APIs and Outside Sources

I am barely a novice coder, but is there some good documentation that could walk me through pulling API data from an API source, select/manipulate/display it?

I want to pull data from League of Legends to display either last game or current game info, even if only my character name and K/D/A. Along with the character portrait. I have worked with it before in python, and pretty sure they have all the data I would need in their API.

Any thing helps! Thanks!

Heres an incredibly simple example of pulling info from the us treasury and displaying it