Update 10:

KiCAD; Fixing all errors & assigning footprints!

I started the session off by running an Electric Rule Checker test, which unfortunately gave me 4 errors :( Not sure what to do, I read a paper on wiring in KiCAD, which even though was VERY boring, I was able to pinpoint all 4 errors down to their causes. Thankfully, after debugging for a bit, I was able to get rid of all errors!

I also started assigning footprints to all my sensors and components (had to custom make one for ESP32-S3 because they did not have my exact model), so that I can finally move towards making the PCB come to life :)