My First Puzzle Train [Edite: ended]

I had a pretty good week: I made a lot of progress on my writing for school and I sold a bunch of stuff on eBay. Thus here, bringing all that together, is my first ever puzzle train. It’s level 0 to 3, and rather short, but the last car is something special that's on a whole lot of wishlists around here. (coughStardewValleycough cough)

Edit: This ended on May 30.
Here you go. Enjoy! (In keeping with the writing I’ve been doing, this is all philosophy themed.)

Edit: I initially gave a bad clue to question 1. If you were having trouble that might be why. Sorry about that. I've since fixed it.