T: The tip of your tongue against upper gum, pronounce with holding her breath, suddenly left, bursts with air flow from the mouth. J, Q & X: The front part of your tongue sticks to the hard palate, use your tongue against the hard palate to obstruct air flow. This will create a chafing sound

That's a difficult question to answer with text.... ChinesePod has a pretty good tone explanations and practice (for free): https://chinesepod.com/tools/pronunciation/ If you speak English: Q is similar to a 'hard' ch - like Cheese. The tip of your tongue/front of your tongue should touch your hard palate. X: sounds almost like the 'sh' in she... but the 's' sound is a little stronger. it's almost like a 'ssssh'. The back/middle of your tongue should touch your hard palate, but the tip of your tongue shouldn't touch your teeth. J: is similar to a hard 'j' in English, similar to Jury, Jasmine,etc. Like the X, the middle of your tongue should touch your hard palate. At the end of the day... it's very difficult to tell someone exactly *how* to form a sound. There are basic positions that your tongue will probably be in, but many people form the same sounds in slightly different ways. Usually the best way is to listen to each individual sounds repeated and then record yourself making the sound. Use different mouth positions until you find one that matches the sound recording and then practice it.

j is soft t q is soft ch t is quieter d