Quality is delighting customers
As you are practising actions, initially go with QTP Help.
If you find any difficulty then post question and that could be ideal way of learning.
Suggest you don't expect everything from others.
There are three kinds of actions:
reusable action—an action that can be called multiple times by the test with which is stored in the local test as well as by other tests.
external action—a reusable action stored with another test. External actions are read-only in the calling test. They can be modified only in the test with which they are stored.
Non-resuable-actions —an action that can be called only in the test with which it is stored, and can be called only once
For Parameters refer :http://qtp.blogspot.in/2007/11/qtp-parameters_12.html