however, the scope of application on ARM microcontrollers is very very wide.
You're asking for help on the forum where to start, well the few links above can certainly help.
Each new experience that consists of learning a new things is long, requires personal effort and depends greatly on the skills you already have.
"More Importantly I need to do my college projects based on embedded systems but I don't know where to start and what to do?"
It will already be wise, in your first question, to say precisely what you plan to achieve with an STM32F4. From what you already know how to do from a programming and electronic hardware point of view.
Good luck,
BR
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