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θ/ and /ð/ These two speech sounds can be difficult to pronounce or

Is there a rule for pronouncing th as θ or ð /?
As a general rule of thumb, initial 'th' is voiced in function words (the, then, there, those, that, this, though) and unvoiced in other words (thistle, thumb, third, theory, thorn, thing).
Initial 'thr' (through) and 'thw' (thwart) are always unvoiced.
I don't know the reason for this.
How do you pronounce the sound θ?
To make /θ/, place the tip of your tongue between your upper and lower teeth.
Push air out of your mouth between your tongue and your teeth.
You should feel some friction (resistance).
Do not vibrate your vocal cords.
What is the phonetic difference between the segments θ and ð?
As in the other cases in which consonants are arranged in pairs (see table 2), /θ/ and /ð/ share manner and place of articulation and differ in voicing (/θ/ is voiceless and /ð/ is voiced).
This means that the only difference between them is that /ð/ is produced with vocal fold vibration and /θ/ without.
The difference between /θ/ and /ð/ is that /ð/ is voiced and /θ/ is not.

CONSONANT SOUNDS: /θ/ and /ð/. /θ/ and /ð/. These two speech sounds can be difficult to pronounce or properly articulate for non-native speakers of the Autres questions

The problem of pronouncing the English th sounds /θ/ and /ð

θ/ and /ð/ These two speech sounds can be difficult to pronounce or

Is there a rule for pronouncing th as θ or ð /?

How do you pronounce the sound θ?

What is the phonetic difference between the segments θ and ð?