API , REST API -EMBEDDED POWER BI

Hello All

I am learning power bi and want to know about API, code from github , how to use those codes. how to use code from github.

Please refer any documentation or videos , a complete guide so that i could follow along.

I've spend many hours in finding how to do all this , what i mentioned above, but i did'nt get a solid explanation or steps to follow.

Good on you all