1.PHP- Getting started with variables,
2.PHP- Conditional logic,
3.PHP-Working with html forms,
4.PHP-Programming loops and Arrays,
5.PHP-String manipulations and Security issues,
6.PHP-Date and Time functions,
7.PHP-Manipulation of Database,
9.PHP-Code forf the Forum application .
The above are the categories where the learner can exploit their knowledge.This application gives more examples for each tutorial,well explained examples with clear cut.