Dill is an annual. That means it sprouts, lives, flowers, and dies all in one growing season. I'm surprised it hasn't bolted (flowered) already for you. It will eventually. The green flower heads can be used for pickles. Or let the seed mature and use the dry, mature seed in the kitchen or sow for more dill.

Dill grows best if direct sowed where you want it to go rather than transplanting. It grows wonderfully direct sown into the garden bed.

FataMorgana

It has indeed started to flower. It just started flowering within the past week or so.

Once it flowers, it will dry up and die pretty soon. Just take the seeds and save them. Try to use as much of the fresh dill for salads, fish, chicken, eggs, pickles or whatever you like and then dry the seeds from the flowers. The dill seeds are very good to use for seasoning all winter in anything you want to taste like dill.
If you save some seeds until this fall or next spring, you can use them to plant some more plants.
It isn't called dill weed for no reason. It's a very easy plant to grow. The only thing is, it's a cool weather plant and short lived. So don't feel bad when it dies. Just grow some more in the fall.