Hi Nizar, Possible course options has to be decided based on your present roles. If you are working on Linux or any open stack environment, UNIX Shell script is a type of mandate skills that every individual has to get updated with present skills so go with UNIX Shell Script basic and advanced level of concepts which will help you groom better writing scripts on your own by attaining the required knowledge of scripting elements which could be applied on different flavors of OS. Scripting logic needs to be understood on how to apply and there you go with your own ideas articulating the logical base on various OS. Please contact me for Shell script training requirement from our real time experienced professionals. Many Thanks!