best black openings to learn for beginners

For beginners, I would suggest starting with 1. e4 e5 and 1. d4 d5. These are the openings's you'll face most often as White, so playing them as Black allows you to study and experience the openings from both sides, thereby strengthening your play from both sides. I'm personally rather weak in the opem

...in the opening as White in part because I play the French Defense almost exclusively as Black, but rarely face it when playing White, forcing me to learn entirely different positions for each side. I've studied the French more than I've studied the Italian (my preferred White opening) and much more than the Sicilian or KID lines I often end up facing.

Beginners do not need learning openings, just a few opening principles. Learning variations and lines is completely pointless if you haven't grasped the fundamentals.
That has been said here a few thousand times before.

Beginners do not need learning openings, just a few opening principles. Learning variations and lines is completely pointless if you haven't grasped the fundamentals.
That has been said here a few thousand times before.

I'm learning the Sicilian Schevinagen defense for black.
Do you expect learning an opening which you cannot even spell properly?

i recommend the petrov. The theory is easy to understand and most players from begginer level won´t expect.

Beginners do not need learning openings, just a few opening principles. Learning variations and lines is completely pointless if you haven't grasped the fundamentals.
That has been said here a few thousand times before.
And if a beginner played based on principles learned, might there be some principled openings revealed in the process?
Side note for OP-
How are you getting to a KIA as Black? Don't do that, and you might not have to learn it.

i recommend the petrov. The theory is easy to understand and most players from begginer level won´t expect.
Not a bad recommendation. Some people say it's drawish, but it's not drawish at the beginner level(and well above the beginner level).
Beginners learning the Petroff will need to quickly come to grips with the Cochrane Gambit. It's not really sound, but it will give them fits until they learn to defend against it.

I suggest the Tarrasch Defense. It's versatile and gives Black good piece activity. It also provides opportunity to learn how to play with an isolated queen's pawn.

Here's the thing... if you are a beginner, you'll be playing other beginners, and you'll go out of book on like move 4-5 in whatever opening you try to learn. When I started, I memorized tons of lines which I never got to use for that very reason. So I agree with pfren - opening principles are way more important than any particular lines you might want to learn. I'd probably just go with e4 e5/d4 d5, because that's where you'll learn the basics the quickest.