Yeah you can use it to get an idea of what to search for in google so you dont have to go thru the simptoms of every nutrient and macro/micro nutrient deficiencies of toxicities.
Using these charts, if you suspect a certain toxicity or deficiency, look up an article on that particular one. It will give you a better idea and also show real affected cannabis leaves.
Looks fairly accurate, but there are variations to each toxicity and deficiency. Google "cannabis toxicity" and go to the images. You'll probably see a couple more charts that look exactly like this but include the toxicity stages also.