Escape and Evade Survival
Learn to use a paperclip to pick the locks of your handcuffs. Learn to break and cut flex cuffs and zip ties.
Always carry a paperclip and/or plastic handcuff key.
The simple Peerless handcuff and the S&W handcuffs have a double lock feature.
the Peerless type, strike the double bars on a hard wall or floor to disengage the double lock.
S&W not so much. Will work but requires a painfully hard strike...
Once the double lock is disengaged, attack the lock. This lock is a simple lever / ratchet that can be lifted by an L shaped bend in the paperclip.
illustration is available online almost everywhere.
Zip ties and flex cuffs can be broken by a determined individual.
Use your observation and instincts to your advantage.
If you can not or do not, you will die.