Renormalization in light--cone gauge: how to do it in a consistent way

We summarize several basic features concerning canonical equal time quantization and renormalization of Yang--Mills theories in light--cone gauge. We describe a ``two component" formulation which is reminiscent of the light--cone hamiltonian perturbation rules. Finally we review the derivation of the one--loop Altarelli--Parisi densities, using the correct causal prescription on the ``spurious" pole.