>>105900745
>How difficult is it to learn and utilize apis in 2 weeks?
APIs are basically functions over the network.

They have a function name (URL path), function parameters (GET / POST body), and can return something back to the caller (JSON)

As long as you understand that, you shouldn't have much issue implementing or using one. Maybe the other stuff on the side like databases perhaps.

with regards to a web app that you could build in 2 weeks, you could try something like a chatroom plus a synchronised youtube video playlist using socket.io, pic rel is what I did literally 10 years ago