IMPORTANT: If this step is done wrong, the threads on the pedal or the crank might get stripped. You should tighten the pedals by hand as much as possible and then fully tighten them by using a wrench. Ensure you do not cross thread the pedals while tightening them.
IMPORTANT: Right and left pedals are different. The direction of each pedal is printed on the pedal (As shown in the photo below)
Tighten the right pedal to the right crank by turning it clock wise by hand.
You should be able to tighten the pedal almost all the way down by your hand
Then tighten both pedals fully by using a wrench.
IMPORTANT: The pedals should be fully tightened otherwise they might get loose gradually, which might lead to crank and pedal threads stripping and sudden pedal detaching from the crank