Strong tags are used for text that you want to stand out like this.
B tags are used for bolded text, like this.
Em tags give emphasis to the text like this.
I tags create italicized text like this.
Q tags mark the beginning and ending of a quotation, like this.
while 1==1 : #this infinite loop is eclosed by code tags
print "spam"
Kbd tags indecate that text is imput by a user frome a keybord, like this.
Sup tags indecate superscript like this.
Sub tags indecate subscript like this.
Span tags appear to do nothing because they are not used on their own, but are used with atributes.