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.
No, do not Top it. Autos should be TOPed befroe the 5th pair of true leaves fully open, why? because after that the plant start flowering, and at that point the plant should not be topped.
First let me state that I like to keep things simple, which in my case is a grow, bloom and calmag additive, nothing else. Well pH up and down too, but that can be whatever brand you find.
I've used the biobizz starter pack. Good for beginners, but I would recommend to do without the TOP MAX, it is rather expensive and I never saw any difference when using it and when not, so use only their grow and bloom nutes. The only con is that it's not too concentrated and even following the recommended schedule you can have deficiencies, also if your water is too soft it does not have a cal mag alternative and it can give you calcium or magnesium deficiency.
The other one I've tried is GROTEK: it is much more concentrated. I use the GROTEK Solotek Grow, Solotek Bloom and Cal-Max. I've had excellent results with this ones.