The letters ح-ع-غ might be the most difficult to pronounce in Arabic for a new learner. However, you can practice in front of the mirror.
For the letter ح(Ha) the tongue does not participate in pronouncing the letter, place the fingertips in front of the mouth to feel the hot air coming out when pronouncing the sound, place the other hand on the larynx to distinguish that the vocal cords do not vibrate.
For the letter ع(Ain) , place your hand in front of the mouth to feel a slight release of air from the mouth, then place your hand on the larynx to feel the vibrations of the vocal cords when pronouncing the sound of the letter.
For the letter غ(Gha), put a little water in your mouth and keep it at the farthest corner of the palate, then gurgle so that the letter sound is made, and place your hand on the larynx to feel the vibrations of the vocal cords when pronouncing the sound, while placing the other hand in front of the mouth so that you feel the friction and continuity of the sound. غ(Gha) Also sounds like the letter (R) in French language.