What are the differences in pronunciation between Tian and Qian, Dian and Jian, Jiao and Diao How to judge the Chinese characters (Qi and Ti), such as Dian and Jian, Tian and Qian, Jiao and Diao, Qi and Ti, is confusing.

I don't know if you have a problem with listening or pronunciation. The problem is actually the difference between the tip of the tongue (D, t) and the surface of the tongue (J, Q, x)
The middle tip of the tongue d t should be pronounced by pressing the tip of the tongue against the gingiva, while the surface of the tongue jqx should be pronounced by pressing the front of the tongue (far behind the DT) against the front of the hard palate (the part of the ridge behind the root of the tooth)

Does this pinyin have four tones?

Yes,
What do you mean
Yu --- ancient jade ornament hanging on both sides of the crown to plug ears
掭 --- 1 gently stir 2 to dip ink with brush

How to pronounce Tian

And "Tian": te (T) Yi (I) an (an) = Tian

What are the differences in pronunciation between Tian and Qian, Dian and Jian, Jiao and Diao How to judge the Chinese characters (Qi and Ti), such as Dian and Jian, Tian and Qian, Jiao and Diao, Qi and Ti, is confusing.