The safest option of course is to have your bike indoors behind locked doors. For many this is not possible or simply not practical. Our recommendation is to use a Motorcycle type chain or D-lock, insurance, lockable bike shelter and/or full fabric cover. All have their pros and cons, though a high quality lock is essential.
Always lock your bike in a busy place with a high quality lock tied to something that is at least as strong as your lock ie lamp post or a beefy fence.

Always lock your bike in a busy place with a high quality lock tied to something that is at least as strong as your lock ie lamp post or a beefy fence.