Hi! I think I’m pretty qualified to answer this since I didn’t even know how to write code a year ago.
In my opinion the best way to learn how to use OpenAI’s API (or really any technology) is just to play with it and try to get it to work. First step is installing python and Visual Studio Code. One you’re done that just create an API account and get to playing.
ChatGPT is actually an incredible partner in your learning journey, but don’t forget that it doesn’t actually have access to the latest documentation or info so if you ask it something requiring that it will almost always hallucinate.
What I did when getting started was just copying and pasting the API Documentation into ChatGPT and asking questions, or working with the model to write code.
Also watch a ton of YouTube videos 
If you hit any speed bumps just come here ask!