[Help] What's the best way to learn this api?

Questions such as how I set up my redirect URI, I have everything coded but I need someone to help me with the Curl and integrating into my website, I’m new to the whole JavaScript/PHP side of web development but I know HTML/CSS and I am proficient in Java as well so picking up topics won’t be hard, I just like working with someone better than reading articles. @IllusionaryOne