Looks like at least thrips, bug-wise, Calcium deficiency or pH lockout going on.... Soil looks bad. You probably vectored in all kinds of critters from some random outdoor garden soil or something.
One thing a lot of inexperienced growers don't understand is that weed will "survive" under a lot of bad conditions, but, the idea of growing it, indoors, is to provide perfect conditions and then maintain them throughout the grow so that the plants flourish and exceed what they would do under imperfect conditions. You're just providing imperfect conditions, indoors and your plant looks like it's just trying to survive at this point.
Coming here to ask advice is good for starters. Watch some grow videos. Read some articles. When you come across some growers getting results like the ones you want to get, then copy exactly what they do. Don't grow auto flowers or fast flowers, either. Stay completely away from them. That's my advice.
If you decide to start over....Get some Fox Farm Ocean Forest soil, a couple few 4-gallon plastic garden pots (I'd avoid the cloth bags)....Mix in some extra perlite and vermiculite for drainage....weigh the containers both unwatered and watered so that you know when to water or not. pH your incoming water and check the runoff pH, too. Find a good synthetic fertilizer regime like Jack's 3-2-1 system and follow the instructions. Avoid the "Joy Juice" "Super Piss" "Bud Hardener" bullshit. Stick to the basics.