Looks like Microstegium, Japanese stiltgrass. It has shallow roots and is easily pulled.

Thank you for response. Do you recommend using some weed killer ? or will they come back if i just pull them off.

I found this link -https://njaes.rutgers.edu/pubs/fs1237/ I will try to follow it.

I don't generally use herbicides, and find that, especially with a weed like this, hand-pulling works very well and can actually be quite relaxing. :-)

gotcha !!