You mean the 808 slides? (FL STUDIO!!) Double click on the note you want to slide onto and enable slide. Done :) For the rest of the beat I gotta say I just experimented with sounds and vocals and tried to edit them until they sounded good to me. I don't know if it's possible to teach this but I can explain you a couple of things if you have more specific questions. (If so, email me: keksjk1 at gmail.com)
Yo this is fire, can you maybe teach me how to make something like this? I've been making beats for a few weeks but I haven't come close to anything like this.
on Sleep Well - Lil Peep Type Guitar by imgeist
on Dark Trap Beat by prodbyKreeD
on Dark Trap Beat by prodbyKreeD
on Spongebob Squarepants Type Loop by KiestyleProductions
on lil pump all drums by g1a2b3e4