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alright i got a plant and its growing quite good. its about 3ft tall and it's outside. but some of the leaves are turning yellow....why? is it because of nutrition or bugs or something else?

What do you mean "turning yellow?" Were they green when it was healthy? Some weed plants, depending on where you live its completely normal for yellow leaves and yellowish buds. Ive even seen brown bud (really shitty weed, not worth growing)

It doesnt sound like a pest problem if theres no signs of it (chewed leaves, etc) and I cant really tell you whether or not its a nutritional problem, cause i have no clue :b

what nutrients are you using? sounds to me like your plants aren't getting enough nitrogen which is responsible for leaf development and stem growth in your plant. signs of a lack of nitrogen are when your older leaves begin to turn yellow and/or die. this will also cause you plant to grow weak and spindly......hope this helps