ष श स (sh, sh, sa) series and ह (ha)

The next group of letters all sound similar, and they have all have a hiss sound like sh and s.

The first letter is ष (sh).  This is like the English sh as in shell.  However, the tongue is up at the top of the mouth like for the retroflex ट and ड letters:

Yo

Some people do not distinguish this sound--which only occurs in words of Sanskrit origin--from the next sound, sh as in shell:

Yo

The last letter in स (s) as in sin.  However, unlike in American English, the tongue is at the back of the teeth, as in the sounds त (t) and द (d):

Yo

Finally, the last letter is ह (ha), as in ahead.  It is a full voiced "h" sound:

Yo