Read some Oscar Liang's posts about flight controllers
Read Flight Controller Processors Explained: AT32, STM32 F4/G4/F7/H7, How to Overclock FC and Run 32KHz in Betaflight?, Flight Controller Explained: How to Choose the Best FC for FPV Drone.
Read Flight Controller Processors Explained: AT32, STM32 F4/G4/F7/H7, How to Overclock FC and Run 32KHz in Betaflight?, Flight Controller Explained: How to Choose the Best FC for FPV Drone.