Learn French: Bonsoir, Madame ! Le café est chaud. - Good evening, madam! The coffee is hot.

Bonsoir means "good evening". You generally start using it in the late afternoon or early evening, typically around 5:00 PM or 6:00 PM when the sun starts going down. Before that time of day, you just use Bonjour.

Is it normal to just say Madame on its own without the person's last name?

Yes! In French, it is very polite and completely normal to address a woman simply as Madame (and a man as Monsieur). While saying "madam" in English can sound a bit stiff or old-fashioned, in French it is standard everyday politeness, especially when speaking to staff in shops, cafés, and restaurants.

Do I pronounce the "d" at the end of chaud?

No, the final "d" in chaud is silent. In French, many ending consonants are not pronounced. However, the "d" is there because if the word described a feminine noun (like la soupe, meaning the soup), you would add an "e" to make the adjective chaude, and then you would pronounce the "d" sound.

Why do we use Le before café? Can't we just say "Café est chaud"?

In French, nouns almost always need an article (little words like "the", "a", or "some") in front of them. Café is a masculine word, so it takes the masculine word for "the", which is le. You cannot leave the article out like you sometimes do in English!