Spot on the leaves

Also looks like pet hair on the leaves, make sure to keep them out of you're grow room and keep things generally tidy. If you let your pets into the grow room you will get bugs.

Looks like early Thrip damage to me.

hi there, that looks like spidermites to me, these are microscopic little bugs that you sometimes cant even really see with the naked eye. Turn your leaf around and look for really small black dots, if you see that you have spider mites. for sure it's a bug/pest related problem, so what you want to do is make sure the plant and the soil dont become contaminated. Outdoors it's a little bit more difficult, so the only thing you can really do that works is to add bacillus thuriengiensis to it. This is beneficial bacteria that will parasite the bugs and basically stop the outbreak in a natural way. spray 3 times a week for two weeks then once every ten days until the end. it's not harmful to the plant or to humans so you can use it until harvest no problem. Hope this helps ! 🚀

As I suspect in the pictures but is difficult to see, it is probably trips :-( look at the eaten places if you see silvery shimmer. If yes treat it with neem oil :-) all the best my friend: - ) keep it up 🍀👌

Do you sometimes water them during the light-cycle and there are droplets on the leaves? If so, then this could be a kind of burn, similar to when you take a magnifying glass and start burning things in the sun..