The Constantinople hard fork is occurring over the next 24 hours. The average person has to do absolutely nothing. Meanwhile, those running their own nodes need to update their software.
That is it. Almost certainly only one chain will be maintained after the fork, and there will be no opportunity for free coins.
If you go downloading random wallets and importing your private keys, you are very likely putting your ETH at risk.
Learn more about Constantinople.
"Don’t Try to Claim ETH Forks! Constantinople is A non-Event for Most" contains information about the following Cryptocurrencies: