  The BESIII experiment at the Beijing Electron Positron Collider (BEPCII) has
accumulated the world's largest samples of direct $e^+e^-$ collisions in the
$\tau$-charm region. From the collected samples, which include $e^+e^-$
annihilations at $J/\psi$, $\psi'$, $\psi$(3770) peaks and in the region from
3.8$\,$GeV to 4.6$\,$GeV, BESIII has produced many new physics results in the
spectroscopy, transitions, and decays of charmonium(-like) states. This talk
will cover the latest results over a wide range of topics from radiative and
hadronic transitions among charmonium states, as well as the productions and
decays of the $XYZ$ states.
