When praying in the mosque, what do I have to say myself, and what do I not have to say during the prayer? For example, when the imam says “Allahu Akbar” while going into sujood, do I have to say it as well?

Ustadh AbdulAziz al-Haqqan

You say the takbir at each movement yourself, and when the imam says sami' Allahu liman hamidah you say rabbana wa lakal hamd.