A bit of advice about this problem please

Hey guys I could use some advice, I would like to start new grow, but I don't wanna make same mistakes, if you ever had this kind of problem, I am new grower so I am not sure where did I went wrong but yea, anyway this plant is autoflower Royal Haze, 1 month and 2 weeks old under 300W led light - distance about 30cm from light 1st two weeks fed only with water BUT the soil is Biobizz light(ph should be around 6 but I am not sure about that too) and I added to it Vertafort which is time releasing fertilizer - mainly nitrogen ( I think this is where I did mistake...) after two weeks I started to feeding it with Biobizz grow and after that Biobizz bloom and TopMax but I had this kinda trouble with it from start just not in this big state... thanks in advance for all advices =)

If this problem started from the beginning then you either had incomplete nutrients (maybe no cal/mag?) or too much of some nutrient which will lock out other nutrients, or just not enough nutrients. So without having a better idea of what levels and what NPK balance and micronutes you fed, I would not hazard a specific guess. Better for you to research now what this plant wants at each stage of life and have a rough idea of feeding levels. It's all out there.

After that you need to learn about the feedback your plant will give you so you can go off your schedule and cater to the specific strain needs. So keep reading! Good luck!