“You must do the thing you think you cannot do.”
Eleanor Roosevelt

One of the most difficult consonant sounds for non-native speakers is the th or / / sound and the /ð/ sound. Remember that for this sound the tip of your tongue should touch the edges of your front teeth, and the tip of the tongue vibrates a bit while air flows out through your tongue and upper teeth. It’s also acceptable to just touch the back of the front teeth as long as the air is flowing through.

There are two th sounds in English: the voiced th as in that, and the voiceless th as in think.