How do you kill the weeds and not the grass?

Get weed and feed and manual pull up as many weeds as possible. There are tools that help you dig out the roots. You can spot treat the weeds with Round-up, but need to be very careful.

Weed and Feed is good, won't hurt the grass. Not the best option for weeds, but you go with what you can.

Also, keep the grass cut at about 3-inches. It's not too long if you keep it neat, and at this height, the grass "Shadows" weed seeds before they can germinate.

Weed and Feed will not kill your grass. Just make sure you apply it according to the directions so it is most affective. If the weeds are big enough and not too many, remove them by hand or use a tool.

Use weed be gone liquid spray. Try to concentrate on the bad spots. Roundup kills everything, so don't use this or you will have brown spots all over your lawn.

yep, weed-b-gone. it contains 2, 4-D a selective herbicide. kills broadleaf plants, but not most grasses. Apply per label instructions..DONT OVERDOSE.. it is toxic and runoff can pose issues to aquatics in drainage areas.