Depends on width and grade. Installing baseboard is easy, even for first-timers. But adding base cap and base shoe is a bit more difficult, especially when mitering inside and outside corners. Quarter Round Covers the seam between the baseboard and floor. Also used to hide the seam in corners.
All quarter round is a pie-shaped quarter circle.
Nonwood quarter round can be dressed with fancier profiles stamped on at the factory. Installation is easy, even for inside and outside corner miters. And at these prices, mistakes don't cost much. But it's easy to whack your thumb when driving nails in smaller pieces. Doorstop Around the inside of a doorjamb to stop the door from overswinging and tearing out its hinges.