https://www.youtube.com/watch?v=bC5XKpthBc8

but then you wouldn't be able to be the master of the universe if you aren't looking to be so dank...

Lolololol. Just saw this last sunday. 

Don't give up your sanity as a human being for music.

I think I've mentioned this in another post of mine. Before I was a producer, I was pretty deadset on becoming a serious guitar player. I was basically a jerk to anyone or anything that prevented me from reaching my goals and would do everything I could to ensure that all my free time went to studying music.

This was a stupid decision cause I missed out on a lot of "stupid high school stuff" because of it and now I'm stuck with all this knowledge with nothing to really show for it.

So yeah. It's not necessary to turn yourself into a savant to get better at this or anything for that matter.

For example In the chorus of the song say I have a pluck sound from a synth, do I write a chord progression or melody?

That's entirely up to you.

Keep in mind that if you'd like to get the best of both worlds you can use both. Chord progressions can contain melodies like in this track.

Obviously chords contain more notes so they sound bigger but you can always (in massive) just bump up the number of voices per not to make melodies sound bigger

Sure. It doesn't matter how many notes are playing. The way you get "bigger" sounds is by emphasizing the correct frequencies. Making sure that the bass and the mid's are properly being represented.

Also what sounds should I use chords or melodies for?

This is also entirely up to you.

You should use the sound that best represents the chords or melody. With real instruments it's lot more obvious because of the natural limitations of the instruments. Playing fast tremolos on a single note for example isn't best suited for a piano. With electronic music you don't really deal with those limitations though.

? Is there any sounds I shouldn't write chords with and any sounds I shouldn't write melodies with?

I'd avoid writing chords in the very low bass frequencies because you lose a lot of note clarity in that range. Muddiness will begin to take over.

I'm actually going to a concert during late may at the hollywood bowl to see A&B's live acoustic set. 

This is the part where I fanboy about rameses B's dnb sound.

https://www.youtube.com/watch?v=UZGyMuHRx58

Is it ethical to take someone's song and remaster it for your own tastes?

I don't think so. People do this all the time with EQing in iTunes or even in their own cars. Usually people are bass whores and boost the thing to +6 all the time.

This screams Porter Robinson - Lionhearted/ some type of zedd mixture   

I take that as a compliment.