something on my leaf

hi, i have newly started growing, i was growing a photoperiodic plant which I took a clown from. unfortunately, this clown is having a tough life, I potted it too early. also I overwatered it and gave it way too much nuts at the same time so it had a rough patch for 2-3 weeks. now it sorta pulled through and is starting to grow. i have added nuts since and have been giving it very little water, today I noticed that I got nut burn again but I haven't given it any nuts. I attached a picture to make sure it's nut burn, could it be from my light or something like that ? also something is on my leaves, I have no idea what it is, I left a pic attached, if someone could help me out it would be great, thank you
 

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