The only line of defense against bike thieves is a bike lock. If you're going to actively use your bicycle and leave it on the streets, you have to lock it properly. If you lock it, but not the right way, it will get stolen. If you lock it the right way, even still it could get stolen, but at least you tried your best!
As Priceonomics recently reported, bicycle theft is rampant in American cities. If you use your bicycle, there is always a chance it will get stolen. After all, it has some positive economic value and it is left unattended on the streets. That makes your bike an inviting target for a criminal.
So, here's how to lock your bicycle. First, I'll lay out the principles of bike locking that you should keep in mind. After that, I'll suggest to you the 'optimal' bike locking method that you can follow or customize to your own security needs.