Understanding 'Actus Reus' in AP LAWCET Preparation

TBh, Actus Reus is always a pain to understand in IPC. Textbooks explain it as 'guilty act' but that's so vague. I need a concrete example or a real-life scenario where Actus Reus is clearly explained. Like, what's the difference between the act and the intention? Is it just about the consequences of the act or does the act itself have to have a certain level of mens rea? Can someone explain with the Delhi Riots case or something similar? Also, how does it apply to sections 304 A and 304 I? Any examples or explanations would be a huge help in making this concept stick for AP LAWCET.