If you know you are not going to be using your carrots right away, put them in a bowl of water. Carrots out of the garden only last about day without water and then they shrivel up into gross little things.
If you notice, some of my carrots are twisty, this is because I planted them too close together.
Gardening tip: When planting carrot seeds, scatter them all in a row about and inch or two below the soil. You want to till your soil so it is nice and soft. The delicate tip of the carrot is the part that grows down so it needs soft soil.
Here is the hard part. When they come up, you have to thin them. This means you have to pull carrots that are too close together and toss them so the existing carrots have room to grow. I didn't do this. I don't have the heart to pull up something I grew unless it is to eat it. Thus, my carrots are twisty and all tangled together. Maybe next year I will learn...
Because the carrot grows underground it is sometimes hard to tell when they are ready. Often times the head of the carrot will pop above the soil and start to turn green. Like potatoes, any part of the plant that touches sun will turn bitter, green, and not delicious. When the head of the carrot pops out of the soil, harvest it!