How do you say "at night"....le soir?...how about in the morning, in the afternoon, i don't know what particles to use

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le soir = in the evening, at night
le matin = in the morning BUT in the morning with a specific time = du matin
onze heures du matin (11 in the morning/a.m.)
l'après-midi = in the afternoon

the way to say "on" with any day of the week is often also with the definite article = (compare these) "on Tuesday" = mardi BUT "on Tuesdays" = le mardi OR tous les mardis.
On July 4th = le quatre juillet

Mme