Online Education Resources
The Physics Classroom is an online, free to use physics website developed primarily for beginning physics students and their teachers.
http://www.physicsclassroom.com/
The Engineering Toolbox for Resources, Tools and Basic Information for Engineering and Design of Technical Applications
https://www.engineeringtoolbox.com/
Free ebooks and other resources for a wide variety of topic areas including, physics, chemistry, mathematics, social science and humanities.