Essential discussion needed on single qubits  which  are given in ket  notation based on Dirac  notation. This is important to not get  stuck the math  of the  various linear  algebra  equations.  
- several resources 
	- this crash course via [Microsoft](https://techcommunity.microsoft.com/t5/educator-developer-blog/quantum-gates-and-circuits-the-crash-course/ba-p/380463)
	- this  is also a fantastic reference with [code](https://www.gideonwolfe.com/posts/quantum/basicgates/). 
	- building [colorful quantum circuits with qisket ](https://towardsdatascience.com/building-your-own-quantum-circuits-in-python-e9031b548fa7)code via Medium 

Several single qubit gates