Biography and appearance
Gohan takes after his father mostly in appearance, including Goku's facial features, black eyes and even his spiky hair. At the same time, he has his mother's light peach complexion rather. Also taking after his father, Gohan inherited a Saiyan tail, with was long and prehensile with brown fur. It was removed and regrew a few times during his childhood until removed permanently by Vegeta in their first battle.
When first introduced as a young child, he had short and spikey but relatively well-kept hair. He wore a white sleeveless shirt and green pants with black boots with white lacing. He also wore a Hanfu-style top that was yellow with green sleeves and on the front his family name, 'Son', written in kanji within a large white circle with black lining. He also wore a red cap with the Four-Star Dragon Ball attached to the top.
Super saiyan 1
Gohan attained the super saiyan form when he trained with his father Goku in the room of spirit and time.
He was training to help his father battle the likes of the androids and the monster Cell
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Super saiyan 2
Gohan was the first to attain the super saiyan 2 transformation when Cell pushed his emotions to the limit by killing android 16 and threatening to kill his father and friends
Future Gohan
Future Gohan is the alternate timeline counterpart of Gohan that appears in the timeline in which Future Trunks lives.
Future Gohan is showcased as a twenty-three-year-old man and is depicted as the mentor of Future Trunks. After his fatherdies from a heart virus and cannot be wished back with the Dragon Balls, due to his death being a natural cause and the murder of the Dragon Team at the hands of Android 17 and Android 18 six months later, Gohan becomes Earth's last line of defense. Now a Super Saiyan, he spends the following thirteen years attempting to take down the androids, all the while training Future Trunks in the hope that he may one day be able to defeat them.
Gohan attained his mystic form when the elder kai unlocked all of his locked power.
The ultimate/mystic form allows Gohan to use all of his max power including his super saiyan without needing to transform.
Ultimate/Mystic Gohan
Transformations
Super saiyan 1 ( SSJ)
It's never mentioned on how future Gohan attained the super saiyan form we can only believe he trained to the point in where he unlocked it himself