lesson
In Italian, the word for lesson is 'lezione'. It is used in the same way as in English, to refer to a period of time set aside for learning or instruction. For example, 'I have a math lesson at 10 am' would be 'Ho una lezione di matematica alle 10 del mattino' in Italian.
Today I have a math lesson.
This sentence is used when someone is stating that they have a math lesson happening today.
The lesson was very interesting.
This is used when someone wants to express that they found the lesson they attended to be intriguing or enlightening.
After the lesson, we go to eat a pizza.
This sentence can be employed when people plan on doing an activity, in this case, eating pizza, after a certain event – here, the lesson.