I am not a native English speaker and I am having trouble pronouncing the th sound in a lot of English words, like three, and breathe. Could you please explain to me how to correctly pronounce the th sound with my mouth, with specific examples for the words I mentioned?
The th sound in English can be challenging for non-native speakers. Here's how you can correctly produce the th sound:

For the th sound in three, the tip of your tongue should be placed behind your upper front teeth, and the breath should flow out between your tongue and your teeth. It's important to avoid touching your tongue to your teeth, which can result in the f or v sounds.

For the th sound in breathe, the position of your tongue is similar to the previous example, but the airflow is different. This time, the airflow is directed over the top of your tongue, rather than between your tongue and your teeth.

It might be helpful to practice words with the th sound in isolation, as well as in sentences, to get a feel for the correct tongue and airflow positions. Repeat the following words and sentences several times, focusing on the th sound:

three, breathe, teeth, bath, both
Breathe in, breathe out.
The three thieves stole the bath.

With practice, you'll be able to produce the th sound accurately and naturally.
Can you give an example of how the phonetic alphabet works?