If you are use to Windows or Mac environments Kali will seem like another world. LIke the other OS's Kali has a whole host of apps and utilities at its disposal. The huge choice alone is difficult to comprehend never mind which ones are best.
As with learning anything new you need to take your time and study the material. Setting up Kali Linux and being safe online from the start is very important. Some of the tools in Kali can be very dangerous if misused or mistunderstood. The video below is an excellent quick guide on how to set up your new Kali Linux install on your Linux box or virtual environment.
It talks you through the initial stages of installing essential software which will save you an awful lot of time, believe me. Installing safe browsers for use when on the net and tools to protect you from falling into the trap of being exposed and even hackable without realising it.
These are 10 quick and very useful tips once you have completed your Kali install.
The following books are highly recommended to progress your CEH v10 studies.