It all starts with a young man who sacrifices himself for a child to save his life. After that happened he became conscious somehow but staring into a literal void of emptiness, but then suddenly AAAAAAAAA.....somehow someone was behind him he said you love the dragon world right.
Go to the dragon world he chanted it like a mantra after some time he woke up but he found himself at a house which was similar to Goku's while he was a kid.
Then suddenly he thought something he turned his neck and slightly and saw him having a tail!!! He was so happy meanwhile he was sad too because he couldn't meet his family if he was reincarnated, Bammmm... he had an idea he could collect the dragon balls to help him meet his family again, but he was a kid. So, Goku's power level was low so he needed to train.
He right now did not know where master Roshi was and in this period of time grandpa Gohan was dead, so every day he would train to get stronger and his training routine was..... he would take tree trunks and break it every day 30 tree trunks per day and then he remembered about master Roshi's turtle shell... hey maybe I can make one too he thought. Then he thought "I should not interfere until battle of gods I guess"(Really there will not be a lot of changes Until the Battle of gods when the ritual is done but just take a glance at the chapters before Battle of gods to understand why the things and what are the things that will be different).
And He tried to make one himself after a long time. He succeeded, and wore it every day but it's weight was double because he trained every day and he was stronger so he made the weights also weighted more, so as of him meeting Bulma he removed the weights and acted like how originally Goku was.
Because if he did not act like Goku there would be no Saiyan or Frieza saga because of that no super Saiyan and in this time he would train with master Roshi in the order and become very close friends with krillin and when Frieza kills him bammmm super Saiyan.
It all went the same the Saiyan saga and Frieza saga Goku/the boy learned kaioken and defeated Vegeta , and turned super Saiyan and defeated Frieza but in this he already knows how to go super Saiyan but did not show it to anyone.
He went super Saiyan when after a long time he saw TV in a market then a boy pushed him back and broke the TV and ran away it was the boy's(who is now an adult)/Goku's favorite show preview of first episode, he had not seen this in a long time he had not known how the show was in dragon ball but because of this he turned super Saiyan.
Please wait for the next chapter and thank you and please support me cause I am writing my own manga for first time only. I'll try my best to post them soon. And the main changes start from chapter 17.