Step 3: Modify some settings of Kali Linux

Before starting, we will modify some Settings. 

So just click on Kali Linux on the left side and then click on the Settings.

Now click on System and modify the amount of RAM depending on the amount of RAM on your computer. 

You can give it as 2GB if you want, but 1GB is enough for Kali.

Now click on Network Settings and set "Attached to" as "NAT Network" but sometimes the network is automatically created by the virtual box, and sometimes the virtual box doesn't create this network automatically.

If it is automatically created then click OK.

If it is not created then the following screen will be shown:

If the virtual box is not automatically created the network, then just go to the
VirtualBox → Preferences → Network → + sign.

Now you can see that it creates another network.