hello, welcome to the farm!
it’s best to try and google and figure out what you think it might be?
don’t do anything to the plant, come here next like you just did and see if the answers you get compare with what you think, it’s the easiest way to learn as you go.
i’ve posted a couple charts here, you can google them to get a better view?
you also should google marijuana leaf problems,
because somethings look the same, like over/under watering, light/heat stress, and do on.
you know what you have been doing with your grow, eliminate the factors.