What are the different types of calculating depriciation and how are they calculated

Rather than duplicate and perhaps plagiarize the work of others, I suggest that you Google "depreciation methods". You'll get a lot of good information that will probably answer your questions. Then, if there are aspects of any of them that you need help on, you could follow with a post here on a more specific question.

Given that depreciation methods aren't exactly creative material, I'm not too concerned about plagiarism. However, it's a good idea to get more specific on what you want to ask. There are several methods and each one would have to be explained individually. There are also circumstances that can change little pieces of how it's doen. That would be a huge post into tomorrow.

In other words, too ambiguous of a question.

Here's one link to get you started (and notice it has four of the methods included):
Principles of Accounting Chapter 10 (http://www.principlesofaccounting.com/chapter%2010.htm)