As you see, the double points at the right top of hiragana mean they have a voiced consonant.
This mark is called a voiced sound mark.
In the Northeastern Japan dialect, the /g/ in the middle of words is pronounced as /ng/, which is the same sound as "ng" in singer. You don't have to pronounce the /g/ as /ng/ at all.
Hiragana examples:
Hiragana:
Phonemes:
ki
ku
Meaning:
chrysanthemum (noun)
Tip: The chrysanthemum is the symbol flower of the emperor of Japan.
Hiragana:
Phonemes:
ke
i
ka
ku
Meaning:
plan (noun)
Note: The phoneme /ei/ is often pronounced as "ee" in colloquial Japanese if quickly spoken.
So /kei/ becomes "kee", /sei/ becomes "see", etc.
Be sure that the "ee" is not "ee" in meet but a duplication of Japanese "e".
Hiragana:
Phonemes:
ga
ka
Meaning:
painting artist (noun)
Hiragana:
Phonemes:
ko
u
ko
u
Meaning:
high school (noun)
Note: Please remember /ou/ becomes "oo" in colloquial Japanese.