I use the rope type blacktop crack repair from home depot for small cracks. The nice thing about it, the next year when crack opens up, I reheat with propane torch, it melts & fills crack back up. I take a 3' Chunk of caulk rope, heat in old sauce pan over fire pit, then fill cracks. Just my idea of filling cracks that works for me.
https://www.homedepot.com/p/Latex-ite-Pli-Stix-2-25-lbs-30-ft-Medium-Black-Driveway-Crack-and-Joint-Filler-35099/100084640
https://www.homedepot.com/p/Latex-ite-Pli-Stix-2-25-lbs-30-ft-Medium-Black-Driveway-Crack-and-Joint-Filler-35099/100084640