Hi everyone, This is my first grow. So, do i miss...

yep, as you can see growing is supposed to be so easy , anyone can do it as long as you dont over think it. Some older leafs yellow and die and that's normal . However i do think you're seeing some P/K deficiency , the colorful discoloration on newer leafs is K deficiency and the yellowing on the newer leafs is the P deficiency. That's quite normal the plant wants more PK at this stage in growth + you did a good job with the bloom and top max so the conditions are perfect for the flowers to get fat. Add some PK dont change anything else, you'll see. Hope this helps ! 🚀