There are only two sounds that you will need to learn in using the Morse code.
The first is that of the DIT. When written the DIT looks like a period or a dot
The other sound is that of a DAH, and when written it looks like a dash

Learn the CW Basics Here

CW Basics (2) Here

Learn CW Shorthand Here

Learn About Iambic Sending Here

  It is very important that you learn these two sounds as DIT and DAH rather than DOT and DASH.

 The reason is that when you actually hear the two sounds, they will resemble DIT and DAH, and not DOT and DASH.

 Also, you will find that it is very difficult to increase your code speed if you have to try and convert the actual sound to the DOT and DASH method.

The following table contains links to sound files (.au) for each character code at 18 WPM.

Click on each letter, number or pro-sign to hear what it sounds like.

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SK	End of work
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AR	End of message
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KN	Invite a specific station to transmit
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DN	Slant bar ( / )
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BT	Double dash = Break
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AAA	Period ( . )
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MIM	Comma ( , )
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IMI	Question mark ( ? )
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K	Invitation to transmit

Latin Alphabet