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If you are good at 3-style for 3-blind, then you might have figured out that the E-Perm are just two commutators. If you can do 3-style algs then the e-perm isn't that bad.
Or at least, be able to fingertrick it.

the standard alg
x' (R U' R' D) (R U R' D') (R U R' D) (R U' R' D')
you just memorize with muscle memory. that's pretty much it. To make it easier to learn, notice the R and R' are the same every 4 moves so you just have to memorize which hands do the U and D directions
some people can even sub-1 it

x' R U' R' D R U R' D' R U R' D R U' R' D' is the most common E-perm algorithm. It looks super long and--with all the D-Moves--slow, but it's actually super fast if you learn to finger trick it. It's one of my fastest PLLs (although I'm horrible at PLL)

ZZLL Algorithms By Simon Swanson & Nick Vu Updated: 10/14/2011 C/C R' U R U2 R' U2 R' U' R U' R' U2 R U2 R U' R' U' R U' R' U2 R L U L' U L U2 L' A/A or CxC R U2 R' U' R U' R2 U2 R U R' U R O/O R U2 R2 U R' U R' U R' U R U2 R2 U' R2 OxO L' U2 L U L' U L2...

I can't decide which Gc algorithm to be my main, I know these 2 but I have been using the first one since I learned full PLL. Also what Gc alg do the top cubers use? (eg: the speedcuber's name and alg)

1) R2 U' R U' R U R' U R2 U D' R U' R' D
2) R2 F2 R U2 R U2 R' F R U R' U' R' F' R2

I can't decide which Gc algorithm to be my main, I know these 2 but I have been using the first one since I learned full PLL. Also what Gc alg do the top cubers use? (eg: the speedcuber's name and alg)

1) R2 U' R U' R U R' U R2 U D' R U' R' D
2) R2 F2 R U2 R U2 R' F R U R' U' R' F' R2

The RUD ones are the best.
Ga - R2 U R' U R' U' R U' R2 D U' R' U R D'
Gb - R' U' R U D' R2 U R' U R U' R U' R2 D
Gc - R2 U' R U' R U R' U R2 D' U R U' R' D
Gd - R U R' U' D R2 U' R U' R' U R' U R2 D'

They are very similar to each other so it's pretty easy to memorize.
And just check the from competitive solves tab to see which alg has been used the most (hence which alg is best)

I can't decide which Gc algorithm to be my main, I know these 2 but I have been using the first one since I learned full PLL. Also what Gc alg do the top cubers use? (eg: the speedcuber's name and alg)

1) R2 U' R U' R U R' U R2 U D' R U' R' D
2) R2 F2 R U2 R U2 R' F R U R' U' R' F' R2

I personally use the RUD one, and it's almost certainly faster here
The second one I've heard some people use where consistency in execution matters more (such as big cubes).
There are also wide move algs, that some people find the fastest, but they apparently have some tricky fingertricks, and I don't know enough about them to give any input on that.

I can't decide which Gc algorithm to be my main, I know these 2 but I have been using the first one since I learned full PLL. Also what Gc alg do the top cubers use? (eg: the speedcuber's name and alg)

1) R2 U' R U' R U R' U R2 U D' R U' R' D
2) R2 F2 R U2 R U2 R' F R U R' U' R' F' R2