Most punctuation marks start from the red tile:

name

 

combination

memory tricks

FULL STOP (DOT)

.

red-orange-red

just one square left and back

COMMA

,

red-yellow-red

a bit longer than a dot

EXCLAMATION MARK

!

red-green-red

what a contrast!

QUESTION MARK

?

red-blue-red

why so far?

COLON

:

red-o-red-o-red

two dots

SEMICOLON

;

r-o-r-yellow-r

dot and comma

APOSTROPHE

red-yellow-orange

almost like comma

QUOTATION MARK

red-blue-yellow

apostrophe times two