Section 302 vs Section 304 IPC - Kya Fark Hai Yaar?

Samajh nahi aaya. Main section 302 se 304 IPC tak padh raha tha aur mujhe laga ki dono hi murder ka case hai. Lekin abhi tak samajh nahi aaya ki dono mein kya difference hai. Section 302 mein death penalty hai aur 304 mein kya... jail? Aur section 304 ke under kis type ke murder case hote hain? Kya ye only dowry death ka case hai? Please help. Mujhe lagta hai ki main kuch bhi galat samajh raha hoon. Koi to guide kare ki dono section mein kya fark hai aur main kaise unhe alag-alag karein.