It's not that hard the article corresponds to the gender of the noune like "der Mann" for male, "die Frau" for female or "das Brot" for neutral. Oh and there are 500 exceptions to that rule, because why should natural be easy and follow a comprehensive set of rules.

Most confused words: "der Bus" (the bus, clearly male...) and "das Mädchen"(the girl, because girls are definitely not female...)