Studies of $b$-hadrons and quarkonia at LHCb

LHCb has productive studies of quarkonia and b-hadrons which provide essential inputs to study quantum chromodynamics (QCD). In this proceeding, seven recent results are reported: the observation of a new excited \Xi_b^0 Ξ b 0 resonance in \Xi_b^-\pi^+ Ξ b − π + final states, the new excited B_s^0 B s 0 state is observed in B^+K^- B + K − mass spectrum, the first observation of suppressed semileptonic B_s^0\to K^-\mu^+\nu_\mu B s 0 → K − μ + ν μ decay, the first observation of the decay B^0\to D^0\bar{D^0}K^+\pi^- B 0 → D 0 D 0 ‾ K + π − , the first observation of the Cabibbo-suppressed decay \Lambda_b^0\to\Lambda_c^+K^+K^-\pi^- Λ b 0 → Λ c + K + K − π − , the first observation of decay, and end this report with the first search for the doubly heavy baryon \Omega_{bc}^0 Ω b c 0 and a search for \Xi_{bc}^0 Ξ b c 0 baryon.