newcomer's questions about APIS

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As a newcomer to the development of SHOPIFY API, it is difficult for me to understand the details of the API. 

I have got a lot of questions but find now answer in the api document, such as :

1.How to Post A product with variants,variants images,product images, options in one request

2.must list all of variants when update a variants?

3. Do I have to to sumit all variants detaile information to update one of them

4. how to match options and images


Is there a more complete and unified description for APIs for me to better and quicker understand them ? 

How can I get a quicker response for my questions ?