Add common causes of bugs.
Rename bug hunting approach properly.
Add debugging practices.
Add optimization problem.
Add optimization problem examples.
Add types of knapsack problems and solutions.
Merge branch 'cs'
Add the Fibonacci example.
Merge branch 'cs'
Add system upgrade why.
Add system upgrade not.
Add system upgrade how.
Add fix broken software.
Add an old article on my git understandings.
Add my notes on the speech.
Add simple rules of content management.
Add XHTML samples and validation tools.
Merge multiple branches.

'cm', 'git', 'html', 'maint-js' and 'sys-adm'