LHC [@Faroughy:2016osc] and many other flavor observables, such as lepton flavor violating decays, cf. e.g. Ref. [@Glashow:2014iga; @Becirevic:2016oho; @Bordone:2018nbg]. I refer the reader to other talks presented at this conference in which these aspects have been covered in greater detail [@othertalks].

Summary and perspectives
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In this overview we discussed the recent theoretical progress on the study of semileptonic $B$-meson decays. The focus of our discussion was (i) the dependence of the extraction of $|V_{cb}|$ from $B\to D^\ast l \bar{\nu}$ decays on the parameterization of the underlying form factors, and (ii) the possible interpretations of the very intriguing hints of LFU in charged currents:

-   While the recent reanalysis of $B\to D^\ast l \bar{\nu}$ data from Belle pointed out underestimated systematic uncertainties in the extraction of $|V_{cb}|^{\mathrm{excl.}}$ [@Bigi:2017njr; @Grinstein:2017nlq], the $V_{cb}$ puzzle still remains since both form-factor parameterizations provide an equally good description of current data. The solution to this puzzle will come in the future with Belle-II and with LQCD data on the slope of the form-factors near zero recoil.

-   After summarizing the status of SM predictions, we discussed the implications of the LFU violation observed in $R_{D^{(\ast)}}$. By using an effective field theory description we argued that 