Comment below with something you are grateful for, hopefully this doesn't cause you to break a mental sweat. If it does, email firstname.lastname@example.org to get connected to a training program so that you are ready for whatever mental or physical challenge that comes your way.
Pretty sweet graphic from Teaming with Nutrients. Explains where you will likely find symptoms of which mineral deficiency, because some are mobile, and some immobile. For example nitrogen is mobile, so when your plant needs a little extra it can be moved from older leaves, so you will see yellowing older leaves. Whereas other deficiencies show up in newer growth because it can not take those nutrients from elsewhere. Interesting book man. Little harder to read than the first haha.