Do you know any books where you can learn ti 83plus/84 plus?
I don't think there are any reliable books… some of them I found seem copy-pasted from other sources. I would recommend using websites and pdfs instead, if possible.
Fire Emblem for TI 83/4+ Progress: Demo: 75% Total: 40% Postponed indefinitely
NOOO!!! YOU, SIR, ARE WRONG! Okay, seriously, there is one book that is AMAZING and it is written by one of, if not the, most accomplished calculator programmers ever, the same person who is working on creating a wireless Wi-Fi interface for the calcs. His name: Christopher Mitchell. His book, Programming the TI-83+, is an absolutely fantastic resource that not only teaches pure-BASIC but also Hybrid-Basic and the intro to z80 ASM. Trust me, get it. It'll help you out, A LOT.