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We have not identified the weed. Take a sample to your County Extension Office for identification.
Here is a link to help you locate your nearest office.

https://www.gardeningknowhow.com/extension-search/

It appears to be a species of Mayapple. You can try spraying vinegar just on the leaves, avoiding the soil. If you do anything other than manually pulling them all up, then you may render your soil toxic and not able to plant anything for a season.

I am unable to identify your plant from that picture. You can take samples to your local extension service, and they will be able to identify that for you. Here is a link to help you find your local extension: https://www.gardeningknowhow.com/extension-search/

It is very hard for me to tell from this picture. If you can take pictures and samples to your local extension, then they will be able to help you further. This link will help you find the closest one to you: https://www.gardeningknowhow.com/extension-search/

It can be very hard to identify pest grasses, but it is probably a Juncus species. You can take samples to your local extension service to get correct ID. This link will help you find the closes one: https://www.gardeningknowhow.com/extension-search/

I can recommend a way to start killing it off in the meantime. This will not hurt your soil, so that the target grass can take back over. Pour boiling water over all patches off this, and it will quickly kill it. Keep any remaining grass cut before any seed heads appear.

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