i've been learning a lot lately myself. the big thing for me was downloading hydrobuddy from scienceinhydroponics.com . GreenGene has 25min a video on downloading it and getting started... between that and getting microsoft office 365 free version with excel spreadsheets... i can sorta work my way through were i've been and were i wanna go.. fwiw I just put all my chemicals into the used column (there may be a limit or reverse calculations where you have the program adjust figures to reach a desired ppm profile) i use the other setting where i adjust the components and it tells me what i get (concentrations from weight setting). anyway it takes a second but I already feel a lot smarter.
Oh right and I started with the Jack's 321 because i was running what amounted to and outdoor hydroponic farm of superhot chilies .... i was eating through GH bottles in no time flat, so i figured i'd give jacks a try. anyway i deciced i would use hot water and mix up gallon jugs of stock at a 3,2,1 ratio A)720g PartA, B)480g CalNit, and C)240g MgSO4 in separate gallon jugs. this makes life so much easier on you its not funny, just pay attention and don't F up the numbers.. now when you go to mix up nutes its equal parts A then C then B (as jug A is already 3x jug B is already 2x and C is 1x by weight).... check it with your ec meter ... too strong dilute not strong enough add equal parts of each. i think for a 10 gal mix at 1.4ec im using something like 85ml of each, just measure it with a 50ml conical tube or somesuch
easy peasy, just make sure you get the concentrated mix right.. should last you a whole show or more.