In the days that followed, Uzumaki Qingxi trained tirelessly with Kushina Uzumaki so she could leave the Demiplane. Whether it was Sealing Jutsu or anything else, she completed every task without cutting a single corner. She also trained in Taijutsu with Minato. It was exhausting, but for the chance to go out and have fun, Qingxi did everything well.
For the next three months, Qingxi trained in Taijutsu with Minato every morning and studied Sealing Jutsu with Kushina every afternoon. It was worth mentioning that Minato did not teach her the Rasengan or other techniques. He only taught her the Summoning Jutsu, then focused entirely on Taijutsu.
So, apart from the support technique Flying Thunder God Technique, all the techniques Qingxi knew were Sealing Jutsu she had learned from Kushina. As for why Minato did not teach her Sealing Jutsu, Kushina was simply the better choice. After all, Kushina had taught Minato his Sealing Jutsu too. Qingxi had also inherited more of Kushina's bloodline, as her red hair made clear, so Kushina's instruction would be more effective.
Qingxi had asked Minato about it once, and he had smiled. "You'll do better training with your mom. Apart from Space-Time Ninjutsu, my methods aren't really suited to you. Things like Wind Release and Fire Release won't help your strength grow much. They might even slow your progress. So, Qingxi, be good and study Sealing Jutsu with your mom. That's what matters most for you. As for other Ninjutsu, knowing a few D-Rank or C-Rank techniques will be enough. Remember, don't bite off more than you can chew. Only by focusing on one thing can you become truly strong."
Qingxi actually understood that. Many of the martial arts novels, anime, and television dramas she had watched in her previous life had mentioned it.