男 = 田 (field) + 力 (strength/a plow). The one who works the fields with strength = a MAN. It's one of the most transparent characters in Chinese: the meaning is right there in the two pieces.
男 pairs with 女 (which you just learned) across the language: 男人 / 女人 (man / woman), 男孩 / 女孩 (boy / girl). Public restrooms are marked 男 and 女 — knowing these two characters is genuinely useful the moment you land in China.
Strength (力) in the field (田) — a MAN at work.
男 and 女 mark every restroom door in China. Master this pair and you'll never walk into the wrong one again.