It seems that I have some weird spots on my leaves...

I dont know the causing of the wholes. but i wont be concerned, as long as it dont spread. Go on and its no mistake to reduce the N input,,,, because they look very darkgreen

Caterpillars, Inchworms & Cabbage Loopers Caterpillars and worms eat holes in leaves and leave droppings that look like black specks. Caterpillar “BT” Spray (safe biological insecticide) – This biological insecticide contains the bacillus thuringiensis (BT) bacteria which kills larva and prevents caterpillars from being able to eat. This is one of the most effective ways to kill caterpillars, and won’t hurt most beneficial insects. As a bonus, it also kills other cannabis pests like fungus gnats, worms and moths.Apply a caterpillar BT spray as soon as you see leaf damage, caterpillars or caterpillar poop. BT sprays work best on small caterpillars that are actively eating your leaves. Repeat every week for as long as you’re still seeing caterpillars, though you can give BT more often if there’s a heavy infestation. Make sure to thoroughly mist both the tops and bottoms of leaves, and apply again after a heavy rain (since that will wash the BT away). Since BT is harmless to humans, you can use BT products up to the day of harvest! One thing to keep in mind is BT spray almost instantly stops caterpillars from being able to eat, but doesn’t kill them directly. So although you may see the caterpillars alive and apparently unharmed after spraying, the BT is still doing its dirty work.

Hi @Cannadisco! My bet is that something (mostly your fingers/nails) harmed the leaf a few days ago. When growing, this slight injury has become more and more visible. Nothing to worry about, you're certainly going to tuck this leaf anyway when doing your first pruning. However keep a close eye onto other leaves, if the problem spread, then I was wrong, and we'll need new pictures & informations to refine the diagnosis. Hope this will help, happy growing 👊

I have seen this phenomenon in lots of my grows, only the biggest leaves were affected. This is no bug or pest problem in my opinion, for me it seems that these leaves bunker nutrition for later and sometimes it could be too much for them. But this is only a theory not proven. When this happens to my plants i lower the nutrition of NPK for one week down to 30% of normal dosage, helped me always. Sure the leaves won´t heal but it should help not getting worse.