You want the two part formula Jack's A and B. Lots of people also use epsom salts with these nutrients-search for Jack's 321 for information on how to mix these and what EC you should run them at. You can see videos on how to mix them at the Jack's website too. Another good/easy option is Maxibloom, here is a good long thread on how to use it: https://www.icmag.com/forum/marijuana-growing/nutrients-and-fertilizers/189616-the-k-i-s-s-method?t=191645.Found it on Amazon, but there are so many of them. Can you advise which is good?
Here is what I use, and I absolutely love the results, it isn’t the cheapest, but it speaks for itself in the final product.They are endless. Jacks is reputable for one