First time trying to grow.

First of all, I'm sorry for my bad English, I will try my best to make myself understandable. This is my first time trying to grow. I made a lot of mistakes from the start and I'm still trying to fix it, but I don't know if I can. Like I said, a made a mess. I mixed seeds from a brick weed, an Amnesia Haze and a Indica Aghan, and I also planted it on different dates. This will be my "how not to grow weed" first time experience. 😂 I planted this on 5/30, and put the led lamp at a 25 cm distance. Then I needed to travel. I'm come back on 6/3 (day 3) and found it with this severe light burn on one side. I changed the distance to 65 cm.