Holes in leaves

[Lbay]

My plants were growing great then all of the sudden I’m having problems. My leaves were turning brown, I was told it was a cal-mag deficiency. Now I have holes in my leaves. What are these holes about? Guessing bugs...if that’s right how do I get rid of them? Getting frustrated. TIA.

 

[chemistry]

Need more pics of the plant, as some defs can't be read from one leaf.

 

[Madbud]

Could be grasshoppers or beetles. Unless it gets real bad you can leave it alone. Captain Jacks dead bug or neem oil will work, spray just before dark.

 

[Madmax]

Agree with madbud..could b a grub aswell..are you outside.check thoroughly under your leaves aswell..it appears there is some other insect leaving tiny bite marks on the leaves.the leaf under your hand to the left looks like spider mites but is hard to tell..