What type of lens are appropriate for my needs?

I'm not a serious photographer or anything. I like to blog so I like to take pictures everyday of what's going on, nothing too fancy (mostly pics of food tbh) I have a nikon d3100. What I'm looking for in lens is a really sharp focus. Kind of like macro but not always close up. I don't really have a budget or anything but nothing too expensive please.

To be honest I believe something like the kit lens 18-55mm that probably came with your camera might do quite well. While technically it is not a macro lens, by zooming in to 55mm you are able to stand back a bit and fill the entire frame of the shot with the food. It won't look exactly like a close up macro but some think that the effect is even better than that of a macro.
If you're concerned about the sharpness of your lens the best thing you can do is buy any prime lens that has an appropriate focal length to what you would like to do. Prime lenses are generally much sharper and far less expensive than zoom lenses.
I suggest sticking with the Nikon DX format lenses as I've had great experiences with all of them.

-edit- it's also probably worth mentioning that every lens if used properly can be extremely sharp. Generally speaking your lens will be sharper when it is two stops above wide open aperture, which is usually around F8. Also, if you are using a zoom lens, depending on how much you zoom in or out will generally determine the sharpness of the picture, generally speaking somewhere around mid way through your zoom will be the sharpest point. For most specific information you can look up the MTF curve or modular transfer function of your specific lens and it will tell you where your lens is sharpest.

Without macro, the 18-55mm kit lens should be perfect.

Sounds like you need a macro lens (to get up close to your food dishes) and basic kit lens (wide angle to normal). And maybe a tripod. So you probably already have the equipment you need.

Now all you need is some skills.

(people usually blame their equipment for their own shortcomings)