I apologize if I'm late to this video.  Someone may have already posted this video, but it addresses a lot of issues and topics that come up on here regularly in regards to lethality of shots.

https://youtu.be/MoGPKDJZDjc

       

That is a very good series !  It shows what every newbie needs to see and know. It describes very well what you should be thinking about when you aim at a deer, whatever the shot angle you choose.
 Thank you.  
Chuckc

Very precise and informative! Thanks for posting!