Hadronic $B$ decays and charm at Belle II

We report the measurements of various hadronic $B$ decays at the Belle II experiment using a $362f{b}^{-1}$ sample of electron-positron collisions collected at the $\mathrm{{\rm Y}}(4S)$ resonance. All results agree with the previous determination, and some of them are already competitive with the world’s best measurement. In addition, we present a newly developed algorithm for $D$ meson flavor tagging (discriminating between $D^0$ and $\overline{D^0}$) at Belle II.