The first and foremost piece of information all bitcoin holders should know is that in the event of a hard fork that splits the blockchain, bitcoins you possess will be perfectly safe.
Over the past year or so hard forks have gotten a bad reputation for political reasons, but in actuality, most types of forks are merely protocol upgrades. A blockchain split occurs during a hard fork which in turn branches the chain into two parts. If this happens, there is nothing a bitcoin holder has to do but wait and watch the fork unfold.
The folks at the subreddit r/btc have compiled a very well written frequently asked questions post concerning protocol upgrades and how users are affected. The thread gives details about the hard fork process and what to expect.
Full story at http://bit.ly/2n7qFLu
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