how to evaluate logarithms

we have the logarithm identities

worked example: evaluate ${\log }_2(4)-{\log }_2(8^0)$
${\log }_2(4)-{\log }_2(1)$
${\log }_2(4)-0$
$2$

worked example: evaluate $\frac{{\log }_2(25)}{{\log }_2(5)}$
${\log }_5(25)$
$2$

worked example: evaluate $\frac{1}{{\log }_9(3)}$
${\log }_3(9)$
$2$