Generally when you buy nutes it comes with a feeding schedule and you should start with 1/4 strength of what the bottle says after the 3rd node. Then work your way up to 1/2 strength and maybe eventually full strength it depends on the plant and its individual needs. Some may burn while others...
Do you know what strand it is? Those pics aren't half bad good job on getting this far for your first grow. Good luck on the rest of your grow! And if you got any questions just ask we're pretty helpful around here :)
That's no hermie that a straight male! Cut that mofo down before he violates your one possible good plant left! So I would say you never had a light leak and all is normal you just got unlucky and had a couple males this go around
Yup just like how treegoesmoo said it takes along time for a plant to reveg at least a month minimum in my experience just to get normal vegetative growth again
Looks like mold. IV never had any personal experiences with mold since I always have low RH but if it was me I'd carefully scoop all the stuff out and chuck it. Then try to lower your RH if high or let the top of your soils dry out occasionally