Do basslines ever just play the same notes as the melody? I have heard they play the root of the chord progression but whenever I try that, during the drop when my melody is playing at the same time, they seem to just conflict. Also does a subbass play some sort of note pattern or is it just a long drawn out 4 bar note or something? I'm very confused with how to use bass in my tracks in general. My drops feel really empty though since I feel i'm not using them right, but I can't find a good video on them.

My guess is that if your sub bass conflicts with your melody then either the sub isn't low enough or there's some sort of mixdown error. Typically your sub should only be the root of the chord.

If your sub is clashing with your melody its likely that you are using non-chord tones in your melody. A non-chord tone is basically a note thats not part of the chord. A basic rule for bass is that it should be a chord tone.