Throughout the years Yn started with his training

First was learning about ki his father all might showed Yn the pod he was in and a book that was in the pod to controlling ki energy Yn starts learning on how to use and control ki meditating,letting it flow through Yn body,manipulating it to make ki attacks also to power up more.

Next was martial arts Yn learned martial arts from Aizawa aka eraser head learning different fighting martial arts and techniques also learning how to be stealthy to make sure your opponent doesn't find you.

Next was grand Torino learning to be faster than the opponent

Next was being taught from mr snipe learning accuracy for my ki attacks so to make sure Yn doesn't miss his shots

Next was Midnight she took care of Yn when to be feed let's say Yn has big appetite because of his stomach so Nezu help midnight payment for Yn appetite also midnight teaching yn to respect women and being a excellent mother figure to Yn

Speaking of Nezu he taught Yn how to out smart his opponents and have yn get his education as the hero's we're afraid that Yn be another Nezu with his intelligence

All might trained Yn with weight training Yn likes the training he's getting knowing he's getting more stronger everyday having some father and son bonding all might told Yn his secret and Yn promised that he will never revealed it

Throughout the years of training Yn grown stronger than ever before even battled a few hero's and the big 3 
like,endeavor,miriko,hawk,ryukyu,mirio,nejirei,sun eater,Star and stripes

Yn made a lot of techniques when it comes to ki blast or martial arts,kamehameha,Galic gun,final flash,meteor combination,big bang attack,spirit bomb,kaioken,instant transmission,final shine attack,dragon fist,distructo disk,afterimage,solar flare

Time skip

Yn was 17 years old and It was about to be ten months before ua entrance exam during that time Yn train his body and techniques also from those ten months all might told Yn about his successor izuku midoriya Yn meet izuku they became great friends as Yn helped with izuku training time to time but Yn work on his own training

After the ten months were up it was time for the ua entrance exam

Next chapter ua entrance exam
So be ready as I begin the mha series