wtf PINCHING????

My friends dad told me to go take my little plants and pinch the end flower off ( my plants are only 3 weeks old) and then it branch out to be wider and have more buds is this true? if so how should i go about doing it or should i just pinch it off like he said?

Go to the growFAQ at the top and look at topping your plants. That os what he's talking about.

Here are a few links.

Show me how to do early vegetative pruning and FIM ?
How do I prune to increase production?