I need a list of APIs i can use as a beginner

I have just started using APIs for my projects… I want to know about free open source APIs available so that I can develop more projects to get a grip on how to use APIs.

A gold mine for you - public-apis/public-apis: A collective list of free APIs for use in software and web development.

I love the list @momozor shared. Here are also two lists of fun APIs: