Public APIs:
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)