Water management and basic nutrition.
These basics are bread and butter for experienced gardeners.
Probably the key to success in hydroponics is the quality of your solution
Understanding what the plant needs at her stage of growth and providing her requirements.
If you start to add a bit of this and a bit of that, latest hype additive, you are moving away from what the plant needs, or creating inbalanced macros.
After you filter the water, you can age it a bit if you want, or use it straight up, depending on quality of your filter
I like to mix about three full days solution in advance
What I use in one day, I replace.
So I'm putting 1/3 fresh back into the resovour every day.
One reason is to allow time for the fulvate to chelate, and to fully oxygenise the solution.
Another reason to blend more than one day's food is to tweak formulas.
When you try something new it cuts In more gently.
I add probiotic to my resovour everyday also, up until late flower, so it's good to have the leftover to allow the colony to develop.
A basic solution for veg isn't very complex.
CalMag
Two part coco gro formula.
NK+ ( maybe )
Silica.
Kelp.
Fulvic acid.
Probiotic.
That's about it
Fulvic acid is a humic acid fraction
Humic acid is too large to be able to access the plant in solution.
The active fraction of humate is fulvate
So you probably only really need to supplament a standard amount of fulvic acid in solution ( </=125ppm)
Humic acid will feed your root-zone environment though.
One molecule of fulvic acid can chelate more than 60 molecule of mineral, and allow it to pass into the plant in colloidal solution.
It's the good stuff.
So you've got your resovour bubbling away, food going in and out regularly.
Another thing to consider is temperature.
PH reads differently at varied temperatures, so at least be aware of that, even if you don't control the temps.
Oxygen saturation is reduced above 23°/70, and drops of quite significantly by 27°/80.
Cold temps will shock a plant.
Extremes at each end can create intersex issues also.
Small water heating and refrigeration units for irrigation resovours are available cheaply.
20-23° is goldilocks.
A really good gardener that used to post here called professorJJ reckoned to fill milk bottles with water and leave them in his freezer, then cool his resovour with them.
Sweet tip.