Help with yellowing and burning in flower

I’m not sure what happened. This is my first round growing and everything was looking perky and green, came in this morning to my plants all out of whack. Any ideas on what it could be?

I could be wrong, as I too am new, but since you're in the middle of flowering, it looks like it needs nutes, and specifically it needs phosphorus as it's showing a deficiency and pretty much the same as this website link below.

https://www.growweedeasy.com/cannabis-plant-problems/phosphorus-deficiency