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After a short presentation of the FLAG collaboration, we review latticeresults related to pion, $K$-, $D$- and $B$-meson physics with the aim ofmaking them easily accessible to the particle-physics community. Only aselection of FLAG averages or estimates is presented. For light flavours, wepresent results on the form factor $f_+(0)$, arising in semileptonic $K\rightarrow \pi$ transition at zero momentum transfer, as well as thedecay-constants $f_K,f_\pi$ and their ratio. The consequences of these resultsfor the CKM matrix elements $|V_{us}|$ and $|V_{ud}|$ are discussed. For heavyflavours we focus on $D$- and $B$-meson decay constants and form factors, aswell as the CKM matrix elements $|V_{cs}|$, $|V_{cd}|$ and $|V_{ub}|$. Inaddition we briefly cover the recent advances stemming from the calculation the$B_K$-parameters and touch upon related current results relevant to the Physicsbeyond the Standard Model, which will be the subject of the next FLAG edition.

FLAG: Lattice QCD Tests of the Standard Model and Foretaste for Beyond