Digging deeper into types of ingredients that block sun, things get a bit more tricky. In general I’ve read dermatologists say “physical” sun screen ingredients are best, like zinc oxide, because they aren’t absorbed through your skin like a “chemical” ingredient. But they also leave your skin looking more white.
And beyond that, just wash your face in the morning and night with a face wash product, not bar soap. Something simple from Neutrogena (Liquid Neutrogena).