I want to make songs on my computer using samples and beats. I have no real music experience at all. How would I do this and where do I go to find samples, beats, etc.?

I’m sorry, I’m dumb when it comes to genres and sub genres. I was just wondering whats the difference between rap and hip hop? I’ve recently been trying to get into rap and hip hop (Eazy-E, Bone Thugs-N-Harmony, Run-DMC, NWA, ect) and I’m not an expert at categorization and I was wondering what their differences were?

I am currently working with Daphnia magna (small marine crustaceans) and need to monitor their heart rate using a stroboscope, as it beats to quickly to count individually. Using a stroboscope and a cold light source, I should be able to change the frequency of the stroboscope in order to make the Daphnia heart appear to be 'frozen'. Using this information, how do I finally work out bpm using the frequency?

Thanks beforehand if anybody could help me out!