Beginner Gardening: what do I do with these herbs now?, 1 by gmun

gmun wrote:
I have dill and cilantro growing, both have got really tall, flowered and are going to seed. I'll attach a couple of photos (it's a bit of a mess but I'm not sure what to do so have to attach the messy photos!).

I know I can use the coriander seeds, which I'm going to do. Can I just use them as they are for planting and/or cooking? Can I just plant the dill seeds when they form as well?

Should I cut the plants down? Will they continue to re-grow or do I have to pull them up? If I leave them tall and stake them what will they do then (will they flower again/ keep producing tasty leaves?)?

Also, I have some borage growing and I've read you can eat the flowers. It's getting a lot of flowers... Has anyone tasted borage flowers? Have any recommended recipes/ ways of eating them? Do you just eat the petals or do you eat the whole flower?

Apologies for my total beginner questions!

Thanks!
G