This sound is “voiced.” It vibrates a little bit. It is mostly used in common words, and the tongue is in the same position as Hard TH. Place the tip of your tongue in the same position. Breathe out. Like the letter V, this is a vibrating sound. You should be able to hold out the sound for a couple seconds. You will feel that small sense of heat on your tongue from the vibration.
Use the video to listen and repeat common words.
father, mother, other, than, that, the, their, them, themselves, then, there, therefore, these, they, they’d, they’ll, they’re, they’ve, this, those, though, thus, together, with.