1. Open Source Features
Open Source Features: The software programs and source code available to users packaged together
The open source nature: the use of freedom, freedom to copy, spread freedom, toll free (open source does not mean free, service fee), free to modify, create derivative free
2. The common open source license agreement
GNU GPL (GNU General Public License)
BSD (Berkeley Software Distribution) license agreement
Apache license version (Apache License Version) License Agreement
MPL (Mozilla Public License, Mozilla Public License) license agreement
MIT (Massachusetts Institute of Technology) License
3. Common Linux version
RHEL
CentOS
Fedora
openSUSE
Gentoo
Debian
Ubuntu
4 Red Hat Certified
Red Hat Certified System Administrator (RHCSA),
Red Hat Certified Engineer (RHCE)
Red Hat Certified Architect (RHCA)
