Naruto: I start with one door, and I can open it infinitely.

After Iruka left, Lin Chuan and his adoptive father went to the kitchen to wash their hands and dry them. They then sat down to eat. His adoptive father handed Lin Chuan a chakra paper, saying, "Enter your chakra into this paper, and it will show your chakra attribute..."

"Honey, what attribute will Xiaochuan's chakra have?" Lin Chuan's mother asked curiously as she distributed the bowls and chopsticks and sat down on the stool.

"It might be the water attribute. I am the water attribute, so he should have inherited my chakra attribute," Lin Chuan's father said, looking at the chakra paper in Lin Chuan's hand. He was also curious about his son's chakra attribute.

"This? It's wet. It really is water-attribute." Lin Chuan looked at the soaked chakra paper. Water-attribute is not bad. Using ninjutsu in water can save chakra and increase the power of water-style ninjutsu. There are also many powerful water-style ninjutsu to learn. Water-style ninjutsu can be used for both offense and defense. It's a good start.

"Let me tell you about the changes in chakra attributes," Lin Chuan's father said as he ate, explaining the changes in chakra attributes to Lin Chuan. "Every ninja is born with one or two chakra attributes that they are more compatible with. For example, our family's chakra is very compatible with the water attribute..."

"Having determined the chakra attribute that you have a high affinity with, the next step is to familiarize yourself with your chakra attribute, transform non-attribute chakra into attribute-specific chakra, and when releasing ninjutsu, to combine the environment and call upon the appropriate amount of chakra to release the ninjutsu..."

"This is why every ninja starts learning chakra attribute transformations from the attribute they have the highest affinity with. If the learning difficulty of a chakra attribute with high affinity is one, then the learning difficulty of an attribute with low affinity is nine. The difference is quite significant..."

"If we release water-style ninjutsu by the river, it has a great advantage for us ninjas with high affinity for water-style techniques. We can release the most powerful water-style ninjutsu with the least amount of chakra..."

"There are other chakra nature transformations that are related to the promotion to Jonin. Jonin are the village's top combat force. To become a Jonin, one must be proficient in at least two chakra natures, be able to transform non-natured chakra into chakra of these two natures, and be skilled in using various advanced ninjutsu, taijutsu, or genjutsu..."

"Learning new chakra nature transformations is too early for you. You only need to master the water chakra nature transformation. Once you become a Chunin, you can choose to learn one of the fire, wind, earth, or lightning chakra nature transformations..."

"I understand, Dad," Lin Chuan recalled his cheap Chunin father's account, which was similar to the information he found on his computer in reality; the initial entry wasn't very large.

The nature change of chakra can be seen as the attribute change of chakra, which is easier to understand. The official term in Naruto is "nature," while the popular term is "attribute," such as water or fire attribute.

He also knew more: Bloodline Limit is the fusion of two attribute changes, which can produce attack power far exceeding that of the attribute changes; and Bloodline Elimination is the fusion of three attribute changes.

Chakra can also undergo form transformations, with the Wind Release: Rasengan being a prime example. Adding Wind Release to the attribute-neutral Rasengan creates a form transformation of the Rasengan.

With the addition of wind-style chakra, the Wind Release: Rasengan is an S-rank ninjutsu that combines attribute transformation and form transformation. With a single strike of the Wind Release: Rasengan, Kakuzu's three hearts were destroyed, officially placing Naruto among the ranks of Kage-level powerhouses.

"I'm full," Lin Chuan said, feeling that thinking about things too far ahead was pointless. He put down his bowl and chopsticks in the sink and went to the backyard of the cabin to practice ninjutsu. With his mediocre talent, he decided to take it slow and start with water-attribute transformations.

Now that he's started learning ninjutsu, his training plan needs to be adjusted. His initial training plan was...

In the morning, I refined my chakra to the limit, practicing chakra control by climbing trees and wading through water.

In the afternoon, I throw kunai at a fixed target 200 times and a moving target 100 times each day, and run 5 kilometers with a weight on my legs of 2 kilograms.

In the evening, I jog five kilometers with two kilograms of weight on my legs and practice the "instantaneous movement" technique four times a day.

This is a training plan he developed after opening the gate hundreds of times and coming into contact with chakra more than ten times. This is what self-discipline is. This is top-level self-discipline, and it's training that started when he was three years old.

Only an adult's soul occupying a child's body could achieve such self-discipline, since a child's nature is to be playful and they simply cannot exploit such a young body.

Fortunately, children in the ninja world are resilient, and the physical abilities of ordinary humans in the ninja world are two to three times that of real humans, not to mention ninjas who possess chakra.

Despite opening the door so many times, he did make progress. Since he couldn't access ninjutsu before, he mainly practiced the Three Body Techniques, tree climbing, water walking, kunai throwing, and other training.

Everyone else who transmigrates has a cheat code, and he naturally had one too—a handmade cheat code, which he created himself by hand: his cultivation record book.

[Kunai throws, 722,300 times]

[E-rank Ninjutsu, Transformation Technique, 1350 uses]

[E-rank ninjutsu, Shadow Clone Technique, 1230 uses]

[Rank E Ninjutsu, Substitution Jutsu, 1630 uses]

[D-rank ninjutsu, Body Flicker Technique, 1400 times]

[C-rank Ninjutsu, Water Release: Water Clone, 0 times]

[C-rank Ninjutsu, Water Release: Water Chaos Wave, 0 times]

This is all his training records since he came into contact with chakra. He used all the ninjutsu he could access thousands of times, and the number of hits with kunai throwing alone is over 100,000.

Don't ask why there are zeros and whole numbers, because he has OCD. If he sees that the last digit of a kunai throw is an eight, he will throw it a couple more times to make it a whole number like ninety.

The Three-Body Technique doesn't require practice; a thousand or more uses are enough to become proficient and meet the graduation exam requirements. The Three-Body Technique is just a great skill for crushing noobs; it's useless in high-level games.

Now, he needs to add two more water-style ninjutsu. As for his training schedule, he doesn't need to change his chakra refining. This process can't be stopped until graduation. He must extract as much chakra as possible from his body to increase the upper limit of his chakra reserves.

He didn't need to change the kunai throwing and running skills; he only recorded the number of times he hit the bullseye. He would change them when he could hit the bullseye every time, and then he could learn advanced kunai throwing.

The four times of practicing the Body Flicker Technique need to be reduced, otherwise there will be no chakra to learn ninjutsu. His chakra limit is four times of practicing the Body Flicker Technique per day, so let's reduce it to practicing the Body Flicker Technique once a day. There are still six years until graduation from the Ninja Academy, and practicing the Body Flicker Technique once a day would still amount to more than two thousand times.

It's one thing to reach the level of Shisui, but to achieve the speed of Shisui's Body Flicker requires talent, not hard work. He doesn't have the Sharingan's dynamic vision of the Uchiha clan, nor does he have such fast nerve reflexes, and he doesn't have such precise chakra control.

His body couldn't reach that level of skill. With over three thousand experiences using the Body Flicker Technique, he could easily crush those weak genin.

He can now skip climbing trees and wading through water; he can walk to the top of a tree trunk and step on the water as if it were flat ground without damaging it.

He even tried it in a turbulent river during a heavy rain, and was still able to stand in the rushing water, rising and falling with the waves. Such chakra control was already sufficient.

Then he could switch to practicing Water Clone and Water Ripple. Without the help of the riverside environment, with half the chakra of an A-rank ninjutsu, he could only use three C-rank ninjutsu. Therefore, he could only practice Water Clone and Water Ripple once a day.

If you practice Water Release techniques in a riverside environment, you can use the river water to create Water Clone, which reduces the amount of chakra you need. You should be able to use Water Clone twice and Water Ripple twice. Practicing Water Release ninjutsu in a river environment is much more efficient.

In the morning, I refine chakra until I reach my physical limit.

In the afternoon, I throw kunai at a fixed target 100 times and a moving target 200 times each day, and run 5 kilometers with a weight on my legs of 2 kilograms.

In the evening, I jog five kilometers with two kilograms of weight on my legs, practice the Instantaneous Body Technique once a day, and practice Water Splitting and Water Ripple Technique twice a day.

Looking at his upcoming training plan, he had already pushed his body and chakra to their limits. He would only make changes once he had mastered the Water Clone Technique and the Water Chaos Wave Technique.

Now, the evening practice will begin with a 5-kilometer run with weights...