I am newbie to linux and found that there are lots of distributions(such as Arch Linux,CentOS,Manjaro,Mageia,Fedora,openSUSE,Ubuntu) based on linux kernel.I wanted to know what basics do I have learn so that learning any distribution will not be a tough task for me.
How to learn core linux operations
linux;ubuntu;centos;fedora;opensuse
Here are some helpful links:Linux JourneyIntro to Linux - Linux Foundation MOOC