How to kill the weeds in my flower beds?

There are several recipes here on Hometalk https://www.hometalk.com/search/posts?filter=weed%20killer

Just remember if it kills weeds,it will kill your flowers.

Hi Kat, here's a few home made weed killer recipes you can try - https://greenerideal.com/guides/homemade-weed-killers-use-garden/

You could try putting down newspaper. You could temporarily weigh them down with rocks or cover them with mulch.

We use weed paper or newspaper in several layers or even cardboard to stop the weeds. Be sure to cut holes for your flowers you already have planted. Then add a non bug mulch like cypress or cedar chip mulch over the top to hide the weed paper. You may get a small weed pop up in the mulch but these are easily pulled out if you check once a week or so as you water your garden and make your rounds.