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I thought it might be Japanese knotweed but I don't see any redness on the leaves or the bamboo like stems. Regardless, you can spray it with glyphosate or a brush killer to eradicate it. Be sure to read and follow all instructions.

My first line of defense is boiling water! Several applications of this every few days can kill off root systems fairly quickly. This article will help:

https://www.gardeningknowhow.com/plant-problems/weeds/boiling-water-and-plants.htm

You can try solarization, as well. This article will help:

https://www.gardeningknowhow.com/garden-how-to/projects/how-to-solarize-garden-beds-to-eliminate-garden-pests-in-the-soil.htm

I'd say a weed control blanket, and and pulling any instances of new weeds will be best. In some cases sand can help, but for some plants, it will be detrimental.

This collection of articles will help you with weed control methods:

https://www.gardeningknowhow.com/plant-problems/weeds

Unfortunately, it can be quite difficult to control this plant. There are few chemical methods, but be sure to follow all instructions on the packaging. This article will help:

https://www.gardeningknowhow.com/plant-problems/weeds/coltsfoot-info-and-control.htm

It could be chickweed and here is info on removing it. However, since your bed is planted, the best thing you can do is remove it manually, then cover the soil with about 3 inches of hardwood mulch. Once all the weeds are removed, there are products you sprinkle on top of the mulch that will prevent seed germination.

https://www.gardeningknowhow.com/plant-problems/weeds/how-to-kill-chickweed-best-way-to-kill-chickweed.htm

We don't make recommendations but your local nurseries and home improvement centers might. These articles may help:

https://www.gardeningknowhow.com/plant-problems/weeds/using-herbicide-in-gardens.htm
https://extension.umd.edu/resource/lawn-herbicides-weed-control