Talking about when you do something in Spanish.
I am trying to work out how to talk about 'when you do something' in Spanish. For example: 'in the morning' at lunchtime, tomorrow.
I looked up 'in the morning' and saw in a few texts "de la mañana". However when I wrote l "Él va a estudiar de la mañana" (He will study in the morning", everyone changed the end, and all the corrections were different.
Please can you explain the basics of how to add times to sentences. For example, how do you say "I will go to work in the morning.", "In the afternoon, I studied Spanish.", and "On mondays I go to Taekwondo class."
Please can you explain in English if possible, Gracias.