Whether you wish to be a hacker who is interested in hacking wireless network, web app, database; cracking password, software....; or want to engage in cyber security related works in the future, Offensive Security's Kali Linux (a penetration testing OS) should be always your main "battlefield" and "experimental field".
CentOS (short for Community ENTerprise Operating System) is a free, open-source, enterprise-class and community-supported computing platform that derived from the same source code with Red Hat Enterprise Linux OS. At present, there have been increasing Internet services or applications around the world that require high stability (including a variety of purposes of servers and business applications) are running on it, rather than RHEL.
Remix OS (short for Remix Operating System) is an Android OS based on Android-x86 Open Source Project (AOSP) through deep customization and secondary development. It was started by 3 ex-Google engineers from China, written in C (core), C++, Java (UI). Remix OS for PC allows users to run Android mobile apps/games on any Intel-based PC, and mainly uses tablet PC, all-in-one machine, smart display as its carrier at present.
Linux beginners probably encounter problems like this: feel confused and puzzled facing multifarious tutorial books. Considering the quality level of books and the limited energy of individual, we all hope to be able to pick out the best ones. While, most often, we just got the opposite of what we want, or got half the results with twice the effort. Fortunately, The Linux Command Line (TLCL for short) came out. By reading it, we can go less detours and master more key knowledge.
As an open-source and UNIX-like OS, Linux is so powerful and highly secure that it has been controlling so many IT technology fields of great concern. Therefore, mastering the essential basic knowledge about Linux can make IT professionals scale new heights in work.
CentOS (Community Enterprise Operating System) is a recompiled product based on RHEL's (Red Hat Enterprise Linux) open source. Because CentOS fixed a lot of known bugs on the basis of RHEL, compared with other Linux distributions, its stability is more trustworthy. This is the reason a lot of servers requiring high stability use CentOS to replace the commercial RHEL.
Android-x86 (AKA: Android X86) is an unofficial Android Open Source Project (AOSP) started in 2009 by Chih-Wei Huang from Taiwan. The main purpose of this project is to provide a complete and feasible set of Android system solutions for X86 PC platform, including a whole set of source code tree, supporting documents, as well as Live CD and Live USB.