Yea I'd say definitely nutrient burn and probably overwated too (possibly with wrong ph) with the little info provided. Definitely need to transplant too a bigger pot. If in soil dont give any added nutrients, just ph tap water to 6.8 and only water when pot feels light to pick up. My advice first is to do some extensive research about growing whatever way you plan too, in soil, indoors and with 'x' kind of lighting. I probably spent over 500hrs reading and researching before I started my first grow and it was decent for a first, but I still ran into a few problems and learned alot. So even if you completely screw the pooch on your first 10 grows, it's never for naught, you always learn something and come out more experienced for the next. Second, to get the best advice here or any forum, you need to provide more information. Medium (soil, coco, hydro ect) if in soil what brand (Fox farm, Aurora ect) if adding nutes what and how much, type of lighting used and how far from plants, temperature and humidity of grow area, and water schedule and ph. I wouldnt give up on em I'd stick with it for the experience, you'll get some buds just keep your expectations low, something's better than nothing! Good luck man