Physics is not hard, but if you don't have the tools for doing Physics, Physics become not just hard but impossible to do it, like a mechanic with not his tools, he can't work! 

 For example, Electricity and Magnetism course is filled with strange symbols like grad, div, curl, partial derivative cos and sin combined...etc, and for this reason, this course maybe appears difficult for the first time, and maybe you can abandon physics...

 Please don't lose hope, because you need first some tools for doing Physics, this beautiful subject.

 Those tools can also help you in mechanics and engineering.

 And for this I represent you some concepts before going in electricity and magnetism course:

• Vector calculus: Definition of a vector, scalar product, vector product
• Vector calculus: Flux of a vector
• Coordinate system: Cartesian coordinates
• Coordinate system: Cylindrical coordinates
• Coordinate system: Spherical coordinates
• Coordinate system: Relations between Cartesian and cylindrical coordinates
• Coordinate system: Relations between Cartesian and spherical coordinates
• Trigonometry
• Rotation matrix
• Infinitesimal line element in the three coordinates systems
• Infinitesimal area element in the three coordinates systems
• Infinitesimal volume element in the three coordinates systems
• Gradient operator 
• Divergence operator
• Curl operator
• I promise you further details about operators

 I hope that this course will be useful for you, pass 8 hours of video with pleasure!