Current tensions between experimental measurements and Standard Model predictions for some observables in B-meson decays (so-called Flavour anomalies) have attracted an enormous attention of many particle physicists. Most of these anomalies are related with b -> c and b -> s flavour transitions. To accommodate these discrepancies several New Physics models have been proposed in the literature (e.g. leptoquarks, Z', etc.) leading to the publication of hundreds of papers on this topics. Nevertheless, most observables in B-meson decays involve hadronic input (incl. corresponding form factors and nonlocal hadronic amplitudes) to be calculated using some nonperturbative method, e.g. Lattice QCD or Light-Cone Sum Rules.
In this talk I plan to give a brief overview of the current flavour anomalies, focus on hadronic effects in semileptonic B-meson decays, briefly outline the ideas of QCD Sum Rules and present some results on observables in semileptonic B-meson decays, mostly focusing on poorly studied b -> d transitions.