Leaving a high-priced bike locked up in the city can often be a frightening task if you don't know how to do it properly. Thankfully, Bike Habitat's Hal Ruzal has a guide to not just locking up your bike, but blocking people from taking parts too.
While the bulk of the video talks about simple tricks like locking a U-lock through the frame and wheel and checking to make sure the pole you're locking to isn't movable, he has a few extra tips up his sleeve. One of the most handy is using extra bike chain to create a small lock system for you saddle and seat post (you can make this yourself by following this Instructable). He also recommends using pentagon-sized bolts for your wheels, and stuffing epoxy into the handlebar assembly so thieves can't easily loosen them.