How do u make u'er own song and how do u start it and how do u end it?

most songs are about feeling or nonsense words. first find the words then try singing the words into a melody/beat/rhyme . to start a song you can start however but if you need help you should listen to some genres of the song you want to make and see how they start it off

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i know nothing about writing a song ..

you should just make a song put it online  and advertise on tik tok

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hope this helps!