Public APIs:

APIsList 

23 Free Public APIs for Developers & Free Alternatives List - January, 2023 | RapidAPI

 

Open-source websites to learn the basics of full-stack:

https://www.freecodecamp.org/learn/

Full Course Web Development [22 Hours] | Learn Full Stack Web Development From Scratch

Web Development Full Course - 10 Hours | Learn Web Development from Scratch | Edureka

Frontend Web Development Bootcamp Course (JavaScript, HTML, CSS)

Full Stack Web Development for Beginners (Full Course on HTML, CSS, JavaScript, Node.js, MongoDB)