Konoha village
Uchiha clan compound
It's has been a month since the nine tails attack and the village has been rebuilt but the tension between the village and Uchiha clan keeps growing, despite all of this, you can see two toddler sleeping in cradles.
They are none other than Uchiha sasuke and his older twin brother Uchiha yuto, well, one was sleeping and the other is meditating while laying in the cradle.
Yuto pov
It has been around a month since I reincarnated, I'm now doing what every other reincarnated baby would do, meditate, anyway as I was meditating, I feel a tingling sensation in my body which I registered as chakra.
If I remember correctly chakra is a combination of spiritual and physical energy, there are many elemental attributes but the most well know five are lightning, fire, water, wind and earth.
everyone in this world has an affinity with these elements and some more than others while some less the others, ninjas or shinobis as they are called can use these elements in the forms of techniques called ninjutsu, they can use these techniques by utilizing the chakra, there also other techniques such as genjutsu, taijutsu, fuinjutsu and etc, depending on the training or talent of the users, they can with or without hand seals, are able to use jutsu.
There is also the nature energy that can do many things but I will think about it later, now let's move on to how to unlock and mold chakra, most shinobi automatically unlock their chakra by birth and some citizens chakra pathways are manually unlock by entering the ninja academy.
Now on to chakra molding, in order to get more control of chakra, one must practice exercise such as leaf sticking, walking on tree and walking on water.
Also to note is that chakra is ordinarily not visible to the unaided eye unless it is highly concentrated or manifested in large amounts. This is rarely seen due to the restrictions of eight specific tenketsu known as the Eight Gates, which limit the amount of chakra an individual can release at a single given time.
I'm thankful that I did all those research, back in my previous life, oh and I can gain more chakra by meditating and doing exercises.