if this is one of your 1 st grows the best 5 things you can do to assure you have a good harvest are #1,feed as little as possible,as long as you have a good soil mix only feed once a month in veg,feed once during transition to bud,then feed low ppm bloom nutes of 200 ppm or less every 2 weeks during bud cycle.
The #2 step to assure a good harvest is to keep your light riding the plant canopy within an inch,as long as the glass is cool to the touch allow the plants to grow up into the light until all plants have an even canopy,then keep lights no further than 1 inch away.
#3 Humidity,keep it at 30% or less at all times.
#4 Heat,temps at the canopy & in the room should be below 80 degrees at all times .
#5 air flow,having clean fresh air blowing thru the entire plants is paramount for healthy strong mold free buds.
The way to get very good at growing weed very fast is to do the bare minimum the 1st grow,especially with feeding nutes ,watering & nutrient laden soils,on your 2nd grow if you kept the 1st ultra simple you'll know exactly what a healthy plant looks like,on your 2nd grow you up the nutrients 100 ppm every feeding & build from there,follow that routine to the letter & resist the urge to do more,by your 3rd grow you'll be a master grower & have avoided all the newb mistakes of burnt overfed plants & over watered moldy plants .