In web development, you will be working a lot with APIs, which deal with third-party data. This allows developers to use some of the functionality without sharing the code. There is an awesome Github repository of APIs that you can use for different purposes, and it also offers you project ideas. You can check the link PublicAPIs.org end explore it.
We recommend you to learn about using Rest APIs, HTTP request methods (GET, POST, PUT, PATCH, and DELETE), building a Rest API, CRUD operation (Create, Read, Update, Delete). Different status code, data format (JSON, HTML or XML) used in the request etc.