i love your books

hi so i am writing to ask if the refrences to other books inside the books was purposeful or if it just happened like accidentally. Like recently i was rereading restart (thats a lot of re’s) and i saw that brandon as thinking about calling his movie slugfest which is another one of your books. I also want to know what is your favorite book and if you are planning to write a sequel to the unteachables becuase its my absolute favorite book you wrote. Also do you have any tips for someone wwho wants to learn to write great fiction