Man
noun
The kanji and the word are exactly the same. That means they share meanings as well. Just be aware that this word used alone can sound a bit rude. You'll learn a more neutral option very soon.
おとこ
Since this word is made up of a single kanji, it uses the kun'yomi reading. Here's a mnemonic to help you to remember it: There is a man. Think of the manliest man you can. He works in an auto shop. As a child, he was an auto 子 (おとこ), working at the auto shop from an early age. This turned him into a man very quickly. Like other mnemonics that aren't lined up quite perfectly, your goal here is to get close enough to remember the true reading. Step, step, step, jump!
あの男は、だれ？
Who's that guy?
二人の男はナイフをもっていた。
The two men had a knife.
ほんと、あんたって大人しい男。
You're such a quiet man.