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I am a newbie, please coaching because I wanted to learn linux and want to know more about supporting applications. We are sorry if my grammar a bit chaotic

I'd say a good place to start would be linux.com which has a lot of documentation and articles about all things linux.
Then there's distrowatch.com which keeps tabs on all of the various bundles of linux+supporting applications - called Distributions or distros. Among the more popular and easy-to-use distros are Ubuntu (ubuntu.com), Fedora (fedoraproject.org), OpenSuse (opensuse.org), Linux Mint (linuxmint.com), PCLinuxOS (pclinuxos.com), and Pardus (pardus.org.tr/eng/). All of these provide LiveCD downloads which you can burn to a CD and boot up into a fully-usable environment without touching your existing hard drive (i.e. try-before-you-buy - except that they are all free to use and install)

This is not the right place to post this. Please repost your question in the Discussions & Opinions section of the KDE forums. This section is for discussing ideas and new innovations for the desktop.