The recommended / best steps to load API and auto insert it to database

I need advice on the steps how to:

1. Load API data
2. Auto insert the data into database
3. Load the database

I don’t want to directly use the API data as output instead I want to use my database which gets some of its data from the API as output. I have no problem with 1) and 3) but I’m still wondering how I can achieve the step 2).

Any help is much appreciated.