Large mass, non-relativistic dynamics, large energy level spacing and clear
experimental signature are few of the unique characteristics of bottomonia
that make their sector rich with a wide range of opportunities of study, from the the spin structure of QCD to the extensions of the standard model
Lagrangian, from the non-$q\bar{q}$ states and light quarks dynamics to the
gluon fragmentation functions.
Experimentally, only high-luminosity $e^+e^-$ colliders with $\sqrt{s} \approx 10$ GeV
can collect enough statistics to study this system in details and fully exploit
its potential. For this reason the Belle~II experiment at Super-KEKB collider
offers the most promising prospects for the study of bottomonia in the next
decade.
We will here review the opportunities offered by data taking periods at the
$\Upsilon(3S)$, $\Upsilon(5S)$ and $\Upsilon(6S)$ energies, focusing on the
variety of studies that can be conducted using bottomonium annihilations: study
of conventional and exotic quarkonium spectroscopy, the search for new physics
in rare decays of heavy mesons, the study of the light scalar meson family
using di-pion transitions among bottomonia, and study of QCD bound states like
deuteron and di-baryons with astrophysics implications.