well theres things to remember, i wont get into brands, cuz theres different stuff available depending location, and what store your in
NPK is key. those are the big 3. veggie you need more N, but still a lil P phosphorus and lil potassiom (k)
micro nutrients are great too, from start to finish,
calcium, molybdenum, sulfur, manganese, magnesium, iron, zinc....... the list goes on.
*one thing i found out, if you go into a petstore/aquarium, they have fertilizers that "promote growth in plants, but not to algae". the way they do this is they have 0 NPK, and are just a bunch of micro nutes. they also have a pretty neutral ph 6-7.5 or so, and they can be added and used from start to finish. cheap as dirt too.
Personally, i like using a mix of products,
for veggie, i use 2 different kinds of N heavy ferts, and the micro nutes bottle, and every 2 weeks give it a lil bloom nutes
for flowering i do more, like 5 different kinds of bloom nutes, the micro nutes bottle, every 2 weeks a lil growth nutes, and add sweeteners, etc...
make a soup with water, and add it in, check the pH before ya add it tho. some nutrients have a fucked up pH. also remember to go weak. 1/4 strength anytime ya add a new one,t hen maybe 1/2, then 3/4ths, then full, once ya know theres no crazy shit in it