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Consonants: place of articulation 
By Place of Articulation we mean where the constriction occurs in the mouth, and how the parts of the mouth - lips, teeth, tongue, palate and so on - work together.
You should study a good diagram of the vocal tract with the names of the various parts of the mouth that are important for articulation - the articulators - for instance Roach p. 8, reproduced here with some changes:
Remember the following points:
- bilabial (two-lipped) consonants, p, b: both lips come together
- labio-dental (lip-tooth) consonants, f, v: the lower lip and upper teeth make contact
- dental consonants, þ, ð: the tongue makes contact with the upper teeth
- alveolar consonants, t, d, s, z : the tip of the tongue makes contact with the alveolar ridge
- post-alveolar consonants,
, 
, 
, 
: the tongue makes contact with the roof of the mouth a little further back than the alveolar ridge
- r is also a post-alveolar consonant, although the tongue does not touch the roof of the mouth
- palatal consonant s - in English the only palatal consonant is j : the tongue approaches the palate
- velar consonants, k, g: the back of the tongue makes contact with the velum
- glottal fricative h - this is really an unvoiced vowel
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If you have any questions mail me at peturk@hi.is.