How can I sing in tune?

You can try to put something in your mouth first.

(Better take a sip of water), and then practice pronunciation and singing. The most convenient thing is to learn from Yu-Ching Fei. It is really useful to learn his songs, especially to turn on your voice.

If you want to stay in tune, you can practice scales mainly by inhaling and vocalizing in the above methods. Find some stereo, or electronic organ, piano software or something, and live a better life. It is easy to judge whether it is out of tune.

Play the seven scales of doremifasolatido over and over again. First, play them one by one. Sing the tones of the scale with "A" until you hear what you sing and play.

* * * Ming is something that can be recognized when two sounds with the same scale or similar amplitude are put together. It feels like bees flapping their wings at high frequency near their ears and heads.