If you could suddenly be an expert at any one thing...

[wodaro]

Being an expert with computers would be nice, because every time I try to learn about how they work I get overwhelmed @.@

Another fun one is to be an expert at fishkeeping!! I'm pretty good at taking care of the simple tank I do have, but if I was an expert then I would know how to care for so many unique and exotic varieties of fish! Also maybe I would be able to keep my aquatic plants from dying... Though I've never been good at taking care of out-of-water plants either, even with instructions ^^; The fish do great though!

[Wobblegong]

that's hard because there are so many things I want to be good at... if I had to pick I guess cooking? I like making food for people but it's never as good as I want it to be.

would also be nice to do some sort of nonprofit work

[Corrupted Unicorn]

I want to be an expert at animation! I want to know all about drawing things and making them move, and to get as good at it as the legends!! 

[Memory]

On further consideration, I think I'd be afraid of choosing anything to "suddenly be an expert at".
Who we are, our hobbies and experiences, kind of make who we are. If I suddenly changed into an expert at something I don't know the first thing about today, I wouldn't be myself anymore. It'd be like missing memories.

Part of the "fun" of being an expert is also not just the skill, but also the memories you make, the people you meet, the events you attend and the little achievements you build up.

[Memory]

I'd like to be an instant expert at being a musician.

[krish]

I think that I'd like to become an expert in architecture. I can only dream of the amount of depth I'd be able to add in my art thanks to the detailed backgrounds I could draw.

[Charbomber]

Realistically? Art. I feel like the black-sheep of the internet because every other person seems good at drawing, but I personally mega suck at it. HOWEVER, I kinda wish I could because it's SUUUUPER useful to have as a skill, especially as a gamedev like me.
(IK IK, "just practice" but I don't really enjoy drawing either and when I say I suck at it I mean I SUCK at it. )

For funsies? Creating matter. To hell with it, I'd make The Universe 2™ and it will have robots and dinosaurs and it will be awesome.
I'm starting to realize this question is sorta just a differently-worded "one wish" or "one superpower" kinda question if you take it in that sorta direction.

[candycanearter07]

This might seem really really sappy, but I wish I was an expert at self love/confidence. Like, that's whats keeping me from doing big projects and stuff.

[☆ cordless !!]

i would be an expert at art so i could always draw out all of my ideas and animate all of my ideas. I am always thinking of awesome stuff but then i cant execute it properly.
a close second would be an expert at being undercover,
i could be 1000 different people all at once and live all kinds of lives all over the world 

[PALEOKNIGHT]

I'd like to be an expert in costume making... I always found practical effects and the such super cool. Can you imagine how awesome it'd be to MAKE a monster, and then dress as it? 
I unfortunately don't have much resources for any craft other than drawing, but Maybe one day I will.

[Vidknight]

I had to genuinely think about this for a good minute because there are so many things I want to be an expert on, but I decided on being an expert at every language on earth. It would be so useful for so many situations

I want to listen to a song , read a book, watch a show, whatever in a different lanuage I would no longer need to hope for a translation from a random source, I can just understand it. It would also be great for creating translation for different things that needs it. 

It we're being more realistic though than I would say I want to be an expert at not being jealous. Yes I know that sounds weird, but I do have trouble getting jealous at other successes, and I wish I was better at appreciating their success

[KiwiMeowo]

That's a question I have thought about, except I imagine it would have a cost, like removing one of my current skills, or cutting off my legs. Well if the wish is free of charge, I'm in!

The first thing that comes to mind is music, but if I have to be specific, I'd pick either singing, guitar or piano. I always wished that I am good at music, but the thought of even learning it terrifies so badly because all the scary music teachers I've met before . If I got to learn music, I can make music for my original characters, awesome!

The second place is being good at sports. I don't have much specific sports in mind, just the ones that make me physically strong. Growing up, having been told that women are always weaker than men as made me somewhat insecure about my body and strength, so gaining that strength might hopefully make me feel less scared.

The third place is voice acting. Voicing my characters sounds really fun, but my voice feels too awful. Maybe the hypothetical genie can improve my voice?

[Metropolis]

expert at drawing or photography. I would love to know how to draw, that way I could make more stuff for my site, and create stuff.