I bought this house last year and trying to improve the yard this summer. One of the flower beds looks like this (see picture). There are some hostas in the front and i also see the purple plants but not sure what the rest of the plants are. Can anyone tell me how can i get rid of the weeds and keep the plants ? I am not sure which ones are the bad ones ? Are all these tall plants weeds ?

I am new to all this. Any help will be appreciated. Thanks in advance