How much knowledge I can get ？ 
Many topics can be extended .
To keep reading and learning is very difficult ！！！  
o    Xorg
o    Driver
·         Multi-touch screen
·         debugging modules
o    Kernel
·         sysrq
·         ftrace
·         oops-tracing
·         IRQ
·         framebuffer
·         mttr
·         ACPI
·         BIOS-ACL/ASL
o    Filesystem
·         ext2/3/4
·         proc, sysfs, tmpfs
·         squashfs, cramfs, unionfs, btrfs
·         debugfs
o    Programming
·         Qt/QML
·         Python
·         Shell script
·         Xcode
o    Web Tech
·         HTML 5
·         Chromium
·         Google Web Toolkit
·         Google Apps Marketplace
o    Linux Journal article