First time grower. Yellowing has started. Help!

Hi, it looks to me like PH lock out. What happens is plant stops eating food, starts eating itself - lower leaves yellow and yellow goes up the plant. It should be 6.0 - 6-5 (6.2 is what i use). Check your ph of water mixed together with nutrients you are using. If your ph is ok, then you might be overwatering (frequency is the problem, not volume(liters). Your plant cant get oxygen and it starts suffocating, it goes again to plant lock out(lower leaves yellow). In this case start drying your soil, dont water dont feed... and hope for the best. I hope this helps mate! 👊

That's what I am having a hard time with, the watering. From the comments, seems that I am over-watering. The topsoil gets dry quickly, so I water, and just started giving it nutrients but the yellowing is still there and looks like it's spreading. I will try not to water it

To much water, you need to wait like 2 to 3 days before u feed he/ water her wait for the topsoil to get dry first