Dam spam >_> tell me what you know about the sharingan and its abilities in all it stages
From what I know the Sharingan is a Blood Line passed down amongst those of the Uchiha Clan (although it can be obtained via surgery). It essentially allows a greater amount of clarity/perception in its base abilities, being able to do things like track people a lot faster, deduce illusionary based techniques (Genjutus) as well as plans and retain the knowledge of events you have seen, which ties into copying the Taijutsu and Jutsu of others with ease. There are 3 base stages signified by Tomoe, with each stage having the corresponding amount of Tomoe in the eyes (stage 1 = 1, stage 2 = 2 etc). The Sharingan also allows the user to see chakra flow and gives colour to chakra so that the user can actually differentiatem this is quite advanced as they are not hindered by solid surfaces due to the fact that the Sharingan allows the user to see Chakra through them.
In its most advanced stages the Sharingan allows one to predict attacks before they even come and tell if they're under a Genjutsu by looking at one's Chakra flow. Two Sharingan users can break a Genjutsu if they peer into each other's eyes. Moving away from the perception and clarity, the Sharingan allows the user to use advanced Genjutsu simply via sight, inducing hypnosis on a completely different level and difficulty to the Genjutsu most ordinary ninjas would use. This is so powerful that a Sharingan user could even enter the consciousness of a Jinchuuriki and speak to as well as see their Tailed Beast. Although the Sharingan consumes the user's chakra while active, the amount of chakra that the user must exert is so insignificant that they can keep it active constantly. The Sharingan is activated by the user witnessing a traumatic experience involving loved ones or those incredibly close to them.
Past the 3 base stages of the Sharingan is the Mangekyo Sharingan which allows even more powerful abilities such as Amaterasu, greater Genjutsu use, Susanoo and more. The Mangekyō Sharingan gives the user's eyes enhanced might to the standard Sharingan's generic abilities and access to powerful techniques. Using the Mangekyō Sharingan puts strain on the user's eyes and erodes their vision, eventually causing blindness. This can be prevented by transplanting another pair of Mangekyō Sharingan from a close relative, such as a sibling. The newly acquired Mangekyō Sharingan looks like a merger of both eyes and is dubbed the Eternal Mangekyō Sharingan