Sandy, compacted soil. Half of yard is crabgrass; this side is all sun. The rest of the yard is fair at best. Getting bids to aerate and overseed. I talked to a master gardener at the state fair. She recommended killing the weeds first and then aerating and overseeding. That is my inclination. She recommended tall fescue and maybe some creeping thyme. Most companies use a blend of fescue and bluegrass. One company suggested only aerating and overseeding the better part of the yard. Based on Dr. Google, I may need to renovate, not repair, the bad part of the lawn. I would appreciate all information and recommendations. Please feel free to email me to ask for my phone number to chat. Thanks!