The words above, the, these, this, them, those and with come up constantly in English. We use them over and over, hundreds of times a day. By just learning to pronounce “th” correctly, you are going to improve the sound of your English greatly. However, if you do not pronounce “th” correctly, you risk sounding much less articulate, because these words come up so often.
Here’s how to pronounce “th”. Put your tongue between your teeth and blow air out at the same time. You don’t have to put your tongue out very far, just a little bit. That’s how you do it. Practice makes perfect.