I just found out that this plant we have all over our house was dill, though I’m still not certain. Did some searches online though and found out there were many varieties of dill. Attaching a photo of what we have.
1) Is it really dill?
2) If so, what type is it, and is it good for cooking?
Yes, this appears to be Dill.
The leaves, when crushed should have a tell tale Dill fragrance.
I'm sorry I can't identify the variety.