Well I was just beaten up xD
I can tell you something on the sharingan

and I can't use any of the wiki's for some reason for over two weeks so I can tell you just from memory :/
Well first of all,Sharingan is primarily the KG of the Uchiha.It is one of the three great dojutsu.Sharingan can be recieved in two ways.Either it appears in Uchiha clan members during emotional stress or difficult situations or it can be transplanted from someone who has the Sharingan.For example Obito's Sharingan was transplanted into Kakashi and Shisui's into Danzo.
However it is said that the true power of Sharingan can be achieved only when the user has both Sharingan eyes.The Sharingan can be transplanted into other body parts instead of the eye hole like Danzo had 10 Sharingan in his arm but I think he needed the Senju DNA to do that,idk.It can also be implanted into animals also.There are different stages to the Sharingan.When the user is faced by stress or difficult situations his brain will send special chakra into the users eyes,doing something there and then awakening the Sharingan with one extra pupil then the user's Sharingan gets more powerful with every extra pupil he gets.The sharingan can have up to three tomoes when he is the most powerful the regular Sharingan can be.Of course the Sharingan can further evolve into MS,EMS and it is shown to have a connection with Rinnengan also.The abilities of the Sharingan rise with the stage it is in.The basic capabilities would be:
1.The ability to see chakra and distinguish diferent chakra i think.
2.The ability to see the opponents chakra flow.
3.See when someone is in a genjutsu.
4.The ability to memorize techniques.
5.Better memory,perception,intelligence?,reactions.
6.To percive moves and keep up with high speeds.
7.Cast Sharingan genjutsu.