First grow and having Problems please help

Hey it's my first time growing and I keep running into some difficulties. My plant is a nl x bb feminized autoflower and almost 4 weeks old. On one of the bottom leafs there are holes in the leaf and the green is a very dark green around the holes. The plant has a light healthy green all around but the holes make me worry. I don't have any pics cuz I just noticed before I had to leave the house. But what could be causing this and is it very bad if it's only on one leaf so far? Oh yeah and it's an indoor closet grow and I haven't added any nutrients or anything just filtered water

Hmmm...I would have to see a pic to have any idea what could have done this...are we talking like pin sized hole? or Pen sized hole? Lol...tiny, big...? Is it circular, or irregularly shaped? What soil are you using? You say you keep running into difficulties? Without feeding what difficulties are you having?

The holes are a pin sized, so small, and irregular. I'm using normal home garden soil and bought a new pot and everything. I mist the leafs during night time when the lights are off. Other difficulties I'm having are my leafs are tacoing (if that's the word) the edges of the leafs are turning upwards. I've been told it's due to low humidity so I put a cup of water next to the plant (a day ago). Also when the lights are on I mist the bottom side of the leafs, is that good? Thanks for your help

heres a picture