• What is $d\vec r$
• How are basis vectors defined
• What is $d\vec A$ : This is an oriented area with magnitude equal to an infinitsimal area $dA$ and direction defined by the direction normal to the surface of interest→ $d\vec A=dA~\hat n$
• What is the $\vec\nabla$ gradient operator in different coordinate systems
• What is the divergence $\vec\nabla\cdot$ function in different coordinate systems