There are many possible causes for the noise you're hearing, but the most common source of creaks is loose crank arms.
You might be able to eliminate the sound by tightening the crank arms on the bottom bracket spindle. However, I would recommend removing both crank arms from the spindle and reinstalling them after lubricating the surfaces where the spindle and crank arm meet as well as the crank arm bolts. Use a high quality grease (not oil, such as Triflow) or anti-seize compound.
Torque the crank arm bolts to the factory spec. Crank arms bolts can take a lot of torque -- about 300 ft/lbs. Most people don't have a torque wrench, so you can "guesstimate" this by applying about 50 lbs of force on the end of a 6" long wrench.
Other possibilities are loose chainrings (check each bolt where they are attached to the crank), pedals (lubricate/service bearings), bottom bracket (check it is properly torqued), chain (look for tight links), derailleur idler gear, crack in frame.
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