Installing Arm GCC toolchain on ubuntu


I am trying to learn with ARM, and I have downloaded the toolchain .tar and extracted it to my home directory on Ubuntu 16.04 64bit. As you know, GNU GCC is already on the system. I do not know what to do now, I see no step by step instructions on the I know some linux basics but I'm not a master at it, so excuse me if the next steps are standard knowledge for hardcore linux users. I am a little lost.
Thanks, Chumbi

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