r Sound: How to pronounce the r sound (/r/ Phoneme)

The r sound is called the “alveolar approximant,” which means that you put your tongue near the roof of your mouth and voice out.
l sound: How to pronounce the I soun (/l/ Phoneme)

To pronounce the l sound you put your tongue against your teeth and push the air around the sides of your mouth.
h sound: How to pronounce the h Sound (/h/ Phoneme)

The h sound is Aspirated, you don’t vibrate your vocal chords but it is defined by their position, because it is a fricative.